1971 340

Get CR up to a true 10. To 1, pocket port and good valve job on the heads, or good aftermarket heads, FT cam in the 550 lift and 248 to 252 @.050 range at maybe 108lsa. Air gap with 950HP holley, good headers. That should get you in the ballpark it will be a rascal of a engine. Might want to think about a stroker.