Additional head bolts and aftermarket block is not needed…assuming you plan to stay under ~900hp. Cometic head gaskets will hold fine, and 1008’s will hold at lower power levels. Some believe magnum blocks are tougher, and they are definitely heavier. Stock magnum cranks tested good to 850hp…turbocharged; superchargers are not as friendly. Compression depends on fuel, turbo/supercharger, tuning preference, vehicle use…opinion…lots of different opinions on that. Strokers are harder on the main caps/web, but I don’t know to what extent.
500hp should be cake. Check the forced induction section on this forum.
