318,340 or 360?

there's no replacement for dislpacement! you get free power just from the differences in c.i. between 318 and a 360. might take more effort to find a 360 but the price difference is small. parts are generic until pan,crank, or pistons. reuse oil pan, grind crank, and pistons are a little more. everything else would cost the same as a 318. you can go mild with gas milage in mind and still make more h.p. than a modified 318.