Integral Head 6cyl pulleys the same?

[Desert Rat]

In my quest of looking for 250 a/c brackets, I found a Nova a 1978? with the integral head 6cyl with AC and PS. The ac pump is of completly different design looks like the one from a late model checy truck its the skinny round one. Anyhow it has a 3 groove water pump pulley and balancer, would they work on the early 250? I don't know if theres a short long pump deal with the six's

I ended up needing a different 2 groove pulley for my ps pump to work, mine has the belts close together. I need the one the ps pump came off. He wanted $20 for the pulley. The guy with the ac and ps nova wants $10 for the 3 groove pulleys. and $10 for the ac comp and brackets and $10 for the ps pump in brackets. I wish they were the same. The ps pump itself looks about the same.