I was thinking the same thing about parts availability. I was told by the guy that flowed them that the cross section was about the same as a 572-1 but, I don't have dimensions. I'm using steel rods and the block is stock cam height.

Doug, I was wondering the same thing about the 540.

I was going to start with the cam I already own and then grind later to optimize. The cam is a Comp roller lift will be .800/.760 w/ 1.6 rockers and @ .050 286/300 on a 112 centerline.