Have a boat wanting to put a 502 mag in, I would need the engine too. If you have an idea of who may be able to help drop a name and a number thanks

Probably highly unlikely that you are going to find a 502mag that a shop is just sitting on.

Might wanna check with Jim / Mitch Watson. (Believe its Watson Custom Marine). They have a pretty large number of engines around that place, might be some used ones for sale. Also check with Anthony Smith at HP Mafia