magnum casting numbers and engine quest question

Thanks for the reply guys. Do you know if the magnum heads were all cast the same? Or some had different port sizes.
The heads I pulled off are in great shape and I was going to reuse them. The engine quest heads are for my other car which is making much more power.
Do you think I would have much advantage using the EQ'S on this engine too? It will only have a small cam which last time I ran it with stock heads I got 360fwhp. Here is the cam
Comp 20-746-9

The EQ heads used to be made in a foundry only 15 minutes from my house here in aussie land before they moved to new Zealand. Wish they were still there.lol