How hard is a Carb to TBI conversion?

[pooods]

Stick with the Q-jet over a stock TBI system. The only advantage I have ever noticed is better cold weather starting and possibly a MPG improvement. However, the Q-jet is easy to work on and when in good condition it will start good and have more power than any TBI I have driven. The TBI just dies about 4k RPM's. Not having all the sensors and problems coming along with them is priceless IMO.
The Holley TBI is a better performer. Not cheap but a nice system. Tunable and can adapt to future mods well. Still more aggravating to work on than a carb though.

[Jonboy]

I am in the middle of doing this very swap on my '74. A buddy of mine is upgrading to an LS in his '87, so I decided to run his old TBI stuff vs. going LS. I found a lot of good tech here: http://www.binderplanet.com/forums/f...splay.php?f=75 , and here: http://67-72chevytrucks.com/vboard/s...d.php?t=352321 .

I used the wiring harness from fuel injection connection. It is all new, and was relatively inexpensive, at $245. It is labeled, and it is a really nice harness. Robert has answered any questions I have had pretty quickly, too. Their site is www.fuelinjectionconnection.com . I also had teh luxury of having an '87 parts truck, but the engine, trans, ecm, and harness were long gone. I pulled the fuel tank, but with TBI you could probably either run an external pump, or just buy a new tank & sending unit. The lines in my parts truck weren't all that great, so it wasn't much of a bonus there. You can get most of what you need from a 87-up Suburban or Blazer, too. Not sure about your area, but they are fairly plentiful in the pick a parts here.

The binderplanet site is pretty cool in that a lot of teh guys there are adapting the GM TBI for use on their existing IH engines. Compared to that, we have it easy. I feel like I wussed out buying a new harness compared to those guys....

[355bullet]

here is the new fast unit. ive seen this installed, its clean. looks simple too

http://www.fuelairspark.com/ezefi/default.asp

[lindstromjd]

Originally Posted by Jonboy

I am in the middle of doing this very swap on my '74. A buddy of mine is upgrading to an LS in his '87, so I decided to run his old TBI stuff vs. going LS. I found a lot of good tech here: http://www.binderplanet.com/forums/f...splay.php?f=75 , and here: http://67-72chevytrucks.com/vboard/s...d.php?t=352321 .

I used the wiring harness from fuel injection connection. It is all new, and was relatively inexpensive, at $245. It is labeled, and it is a really nice harness. Robert has answered any questions I have had pretty quickly, too. Their site is www.fuelinjectionconnection.com . I also had teh luxury of having an '87 parts truck, but the engine, trans, ecm, and harness were long gone. I pulled the fuel tank, but with TBI you could probably either run an external pump, or just buy a new tank & sending unit. The lines in my parts truck weren't all that great, so it wasn't much of a bonus there. You can get most of what you need from a 87-up Suburban or Blazer, too. Not sure about your area, but they are fairly plentiful in the pick a parts here.

The binderplanet site is pretty cool in that a lot of teh guys there are adapting the GM TBI for use on their existing IH engines. Compared to that, we have it easy. I feel like I wussed out buying a new harness compared to those guys....

I know firsthand just how bad it is to have a GM system on an IH engine. (I have 2 International Scouts right now). It's NOT a fun time going through all the "spaghetti" (excess wires) and cutting out everything you don't actually need to make the engine run. But it does turn out really nice in the end. Really, it just takes a lot of patience and some practical know-how to make it all work. Stick to the instructions.