Thanks, I'll check out the W9's. They sounded kind of exotic as far as the water manifold and valve train, and coming without valve seats and guides so I hadn't really considered them. I'm assuming they would require custom headers too. I think TTI makes an A-body header for W2's, and I see that Jeg's still sells a W2 head for 48 degree blocks. I only paid a grand for the R-block, it's an early one without the extra bolt holes for the head, and it's not siamesed bore, 9.6" deck.