Hmmm, somehow missed all these posts?
Anyways, sounds like a very cool project! I'm right there with ya on the LSx's since my daily driver is one. GM couldn't make a finer engine. But things are tricky enough on the swap with a Gen 1 SBC, so I agree, LS would be too much work there. Ecotec is a great choice. I've contemplated finding another H just so I can build a stick turbo Ecotec, zip around town in a fun car, but still get 30 mpg.
Hell, if you want to be really different, I've talked with a few different people in the last week raving about tiny diesel 4 bangers being amazing workhorses in fullsize trucks, and knocking down high mpg. Wonder how hard it would be to tweak a turbo diesel 4 banger in an H-body? 10-11 seconds while getting 30mpg?
75 Pontiac Astre GT: 406SBC/TH350, roll bar, S10 goodies, down to 11.47 so far, more to come later.