425 v-8?

While digging through a pile of grandpas old Mopar stuff, I came across a head (apparently for a 425?) Stamped in the head it says "Hi-Perf" and the valves that must have been in it were HUGE! Also, the holes for intake or exhaust (can't remember which) are not round, but square or rectangular. Anyway, dad thought we should bead blast it and make a stool with it but I was interested in its history. Anybody know of and engine this would have been on or if its something we should save? Thanks in advance!