I wanted to buy a Megablock in 07. Wouldn't sell it to me unless I bought as a short block.
Also needed a cam. When I asked about the specs. they wouldn't say. Also told me you cant build a 500 inch motor with a 35 year old block, you'll drop the crank. I know theres issues with mains but it can be done if your careful.

PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure.
..... Now its a door stop....