Well seeing as we've completely left the track here how about this one? 318 Poly block bored .125 with the above mentioned 4" crank for 420+cubes and magnum heads etc. Now you have some torque! There is a post on here https://board.moparts.org/ubbthreads/show...e=0#Post6310954 from a guy with a 67 Belvedere that can't give his orig poly away. Free or almost free is a good start for a project.
how about this one? 318 Poly block bored .125 with the above mentioned 4" crank for 420+cubes and magnum heads etc. Now you have some torque! There is a post on here 