The 250 was using the fluidamper that was also used on the 292. The crank snout is toast. Will get pics. It tried to weld to the timing gear and crank snout.
The GM 8" HP balancer is a GM performance part for 350 SBC. It is used on all ZZ4 crate engines and is the same one used on the 1970 350 LT1. Had to recreate the timing tab as the 8" diameter was much larger than the old damper.
