Hi Team Impala,
Well I took about a year off from my 1968 4 door HT Impala to get hitched to a very special lady (that went smoothly but really put a damper on my car fund money!), but now that it's done, I can get back at it!
I was originally going to swap in an LS motor, but have since decided that the modified drive shaft, new tank, mounts, etc., plus the cost of the motor itself, would be prohibitive in both costs and time. I have visions of driving this gloss black beauty to Vegas next year so I gotta get going!
The car came stock with a 307 pumping out a BLISTERING </sarcasm> 200 HP. The more I read about these 307s the more I realize that they aren't a bad engine (they are a stroked 283) but they just don't breathe very well.
A lot of folks have had luck swapping on Vortec headers from a late-model chevrolet truck, adding a different cam, and some headers -- and gaining significant horsepower -- 270 +, which is adequate for my build at the moment. That is what I want to do as all of those upgrades are within my time and budget.
A bit about the build:
1) I don't care at all about numbers matching for this car -- it is my first and is a 'learner'.
2) I want to drive it on long trips -- fuel economy matters.
So, my question is this:
1) Which Vortec heads should I be looking at (i.e. what are good source vehicles? Does it make a difference if I pull them off the 305 or the 350 (5.0 or 5.7L))
2) If I'm going to a scrapyard for the Vortec heads, whats stopping me from using the whole Vortec engine and benefiting from a newer, more powerful 5.7 Liter Vortec 5000 -- as in, can this be carboreted and will it drop in without too many problems with fuel, drive shaft, etc. that you'd get with the LS?
I've found conflicting knowledge on the above, and this will be my first time tearing down an engine so I want to be as sure as I can be.
I leave these two questions to the god-like knowledge of Team Impalas. Ritual sacrifice to follow