What kind of safe power can you get out of an 84-85 block? I was thinking of building a block that I have here with .030 forged pistons and 2 center billet caps. 400 hp at the wheels OK? It will have the 86-87 intercooled stuff on it. I also have noticed on two HA blocks that there seems to be a line that runs in the lifter valley. Is it a casting line? Thanks!