Here's what I'm thinking. '509 block .040, keith black's w/ 18cc d-cups, 5.7 rods, heads are 72cc, static compression should be around 9.5:1. Might have to mill the heads a little and play with head gasket thickness to get dynamic compression and quench right. I'm thinking flat tappet solid lifter cam. I have a 700r4 with around a 2600-2800 stall and the current gears are 3.08's but I'm building another rear and I have a set of 3.55's, 3.73's and 4.10's to choose from, I am leaning toward the 3.55's. I have 28" tires and I like to run aroung 80 on the interstate. 3.73's would probably be the lowest....of course I'll use what fits the engine combination best. I have power brakes also and I have a vacuum reserve canister. Idle quality.....The Lousier the better, it's a Hotrod Let me know if yo need any other info to run that dynosim for me, thanks.