one other note on that particular 2 bolt. It is currently a 383 using an Eagle cast crank, Eagle SIR rods, and Mahle forged pistons. This is the first Eagle Cast crank i have ever ran. I have to admit, i am quite impressed with how good this Eagle cast crank is doing. I just looked over what you are going to put in for a rotating assembly. That should make a fine motor. I would recomend putting a Race Balance on it though. @ 7000 rpm's My 383 doesnt even feel like its reving.