It would be the block GMPP uses for their 502/502 horse crate motors. this the good one or bad one?No. If you are talking about the Marine and Truck Blocks that was produced as a 502. Rated as 750 hp max. Have heard of them doing some more. The main webbing on the block is very weak. No way to brae it.
Now if you are talking about the one that was called a Gen 6 but was more like a Gen 5 and it had a Chevy BowTie cast on each side, that is a good and strong block and will easily handle your needs.