Hey Blakblur you might think about building your own small block chevy. I put one together for less than 5k. I have a 350 bored .030 (355 cu) with 8:1 pistons, comp cam, comp gear drive, holly 770, and a b@m 177 blower. This put out 510 on the dyno. This gives you all the hp you need. As for a trans I would use a 700R4. With the overdrive you can use a rearend gear around 4:00 I have my engine in an 1800 lb car and I get between 9-10 mpg Good luck on your hot rod. Bud.