Yes, 390 it is. I also have the 9:5 comp as the 2bbl and the 10:5 as the 4bbl flavors. Plus the Z code in the vin tag tells it'a a 390 4v. Scat is making some nice cranks for a stroker. Or find a nice 428 crank. From what I understand the 390 and 390PI shared the same block for 63. Does the block have the triple webs on the crank saddles and bosses for crosbolts by the skirt? G.