273ci thoughts?
This build sounds like a prime candidate for a small turbo on the 273. Nothing fancy, just hang the turbo off a shorty header on the passenger side. A small one that comes on line just before stall rpm. Then put a long-tube on the other side.
Or maybe a pair of small ones one on each long-tube.
Or wait, staged turbos ; a tiny one on the drivers side, and a lil more on passenger side. I mean just small ones; you don't need power at 5000 rpm, you just need torque at from stall to 40 mph. Oh yeah, I think I still got a 273 around here somewhere.............. Now if I just wasn't old, er, I mean had a good solid pre semi-retirement, income. lol.