I'm looking for the steel shim-style GM head gaskets as used stock on the 84/85 hotairs. I was hoping to find the original GM part number so I can get another set. Does GM still make/sell these? Are they available from anyplace else? I know the RJC headgaskets are similar design, probably better, but I'm on a budget and 140+ for head gaskets is more than I'd like to spend if at all possible. If anyone has the GM part number for these gaskets I'm hoping I can track a set down. Thanks!