318 Builds
Nothing wrong with building a 'teen . Just gotta make the top-end breathe with a cam , some head work (or a head swap) , and a decent intake manifold / small 4 Bbl .
Going to a 340 or 360 virtually requires a trans swap ,and does require a motor mount bracket swap on the right-side .
I'm going to warm the 'teen in my daily driver 1972 Coronet by adding an Edelbrock S.P.-2.P. ( just waiting to hear back from Slant Six Dan on it , whenever he gets setup at his new place ) , a small Holley (a contribution from a friend ) and a new cam & lifters ( most-likely from work ) .
Car's already got a Trans-Go'ed 904 (30,000 on it since the rebuild) and some 'flyer gearing (2.71's) in an 8.25" diff .