Well, I am not sure of the casting numbers, I will know this weekend, they are at home, in indiana. I have flat top, 30 over forged trw sealed power pistons, I have a comp cams nitrous roller cam, custom grind (don't know specs off hand), and I have forged internals, a great intake, single plane edelbrock, and a NOS sniper kit, adjustable from 50-150. I am putting a 700r4 tranny to it and I have a 4.10 posi 10 bolt in the car. Its all going into a 78 nova (yeah, the ugly boxes). I'll let you guys know the casting numbers for more advice sunday night!