I have a 406, 10.6 to 1 compression, hyd roller 236/242, dart 215 cc platinum heads, zero decked, flat tops. It's in a 3900lb car with 2500 converter and 3:42 rear. The car pulls very hard but needs more gear and I can't help but think of torque that i am probably missing out on with those 215 runners. A friend swore that those were the one's I needed as a more aggressive solid roller may be in the future. Currently, i like the cam and am kinda making the best of the heads. Wish they were a bit smaller though...say 200cc