You got it, I got some off of E-bay for $177 for my 511". Now I buying cam&lifters, cam bearing, rod bearing, main bearing, because the lifter jumped out the bore. The motor never ran over 6200,shift@5700, but the car pick up .3 with a roller cam.
The cam was a .575/308* street roller V .555/300*M. Picture worth a million words.