Aluminum slant block

I'm sure they can stand warming up some, you just have to be careful. My main concern if I had one wouldn't be to hot rod the heck out of it. I would just get the "deck surface" flat and true and treat it with "something" to keep it from corroding. I wouldn't try to push the boundaries of the block itself. That'd defeat the whole purpose.
The article I participated in with Steve Magnate in Mopar Muscle and Hot Rod had a head gasket failure as the engine approached 200 HP. That's probably not too shabby, but if that's to be an expected issue at that HP range, how long can it live at say, 180 HP, if it's that close to a failure point...? It probably could have also failed in the 180 HP range if it had been given enough time.