Okay, now I am really wishing I had kept that 305, sold it for $75!!!!! Darnit!!!!! That was before I had the GMC panel truck!
Read this impressive article, stock 307 short block, cam/intake/Edelbrock aluminum vortec upgrade:
http://www.superchevy.com/technical/...nce/index.html
This goes to prove my theory of building an awesome daily driver engine out of these 3.875" x 3.25" 307 V8's! The Edelbrock E-Tec's are basically a slightly reworked aluminum aftermarket version of the stock GM iron vortec heads. I think GM Perf. Parts offers a special GMPP version of the vortec heads also, that flows a little better if you want a hotter cam. The stock vortecs with a mild cam are the best thing you could run hands down. the heart shaped combustion chamber in combination with the slightly smaller bore on the 307 will give you both performance and efficiency/economy.
I think on the 305, the 1.94 valves on the vortecs will be shrouded by the tiny bores, and I think I have heard of a special 305 vortec head, but I don't know anything about them without researching on the net. 305's have the longer 350's stroke, but a tiny bore.
As it is now, I have some spare 400 blocks and a 350 from an 85 Caprice that my dad bought, thinking I might want it as a backup engine to the GMC 305 V6. THe GMC V6 is such a cool and obscure engine, I like it a lot, but parts are $, and with it's MASSIVE internal component size (crank looks like it came out of a locomotive, it's so huge), it's not designed for hi-perf or high rpm's at all. They really wake up with ignition and carb mods, but still no hot rod and not that great of city mileage. The cool/unique factor is quite high, but my next options aside from the 351E GMC V6 would be a 200-some lb lighter sbc along the lines of a vortec 307/327/350 or maybe put to use one of my extra 400 blocks with a stock 400 rotating assembly, vortecs, and an RV cam. I know this 400 build would be overkill for the non-hotrod status of my truck, and would be much harder on gas, but it's what I have. If I had the 307, it'd be the hands down #1 top choice after milling over these thoughts in this thread!