Anyone ever run Speedmaster Heads on their small blocks

i have a couple sets of assembled and bare heads....never seen a grain of sand in the heads.....they dont use sand boxes to cast their heads to begin with....
I paid 250 bucks for springs and valve....retainers and locks.....machine shop charged me 300 bucks to do the competition valve job and assembled the heads which includes flowing one port....

this is a budget set up on a budget short block......car needs more work and track time