Headers vs Cast Manifolds for Low RPM

[Pyrotechnic]

Depends what you set your initial timing at and how many degree's your advance can will pull in and how much your motor can tolerate. I ran a stock 350 and with 8 degree's initial timing and a stock HEI on manifold vacuum. I have idea how much that can pulled in and no idea what the total timing was since there was no timing tape, but it never pinged and has a good sounding idle so I wasn't worried.

By comparison, if you have an aftermarket cam that likes around 34 total and 13-14 degree's initial, you need a crane cams brand limiter plate and adjustable vacuum can and limit it to 10-12 degree on the can, then use the internal screw in the can to adjust the rate.

If that Q-Jet has a connector on the top front of the carb, it's electronic. Not going to work. It's a mechanical carb, first verify that you have a 4 hole spacer under it. Second, start finding out what that carb's original application was and go from there. If it's a V6 carb, you can swap in primary metering rods and jets for a stock 350 application.

Alternatively, an Edelbrock 650 or Holley 650 will match up to your intake and have readily available tuning parts.