I used Wisco Pistons in my 572 and they were ordered with the 440-1 valve reliefs and Tom Hemphile cut them for my B1 valve reliefs so I could run either head. My Daytona ran 8.48@159mph with the Indy heads and very low compression and should be very low 8's I would think with the B1 heads when I get the car back out. I had a VERY NICE set of Crower rods but the rod bolts wouldn't clear the cam so I used a set of K1 rods with all the upgrades but I don't beat the piss out of my stuff for that last few hundredths.