In Larry Shepard's book "How to hot rod small block mopar engines" the cam listed for mid 12's is Mopar Performance P4120653AE Mopar Performance Purple Camshaft Kits | Summit Racing
which is mopar's solid 284/284 adv 241/241 @ 50 on a 112 LSA. I used Crowers 31321 which is their solid version of it with 294/298 adv 243/245 @ 50 520/528 lift. It ran 12.6's with that cam and 587 heads.
That said I've seen a 318 run mid 12's with a 218 hydro @ 3500 pounds.
