Slant 6 Aluminum Performance Head

What would be the goal weight savings and or to have a head right out the box that could handle 300-350hp ? which would be an pretty agressive /6 race piece.

A fully done stock head can do about 300 ish hp ??

I don't think so. I'd have to see a 300HP slant with my own one good eye. I think the limit for a street engine on 100% pump gas is probably 250-265. But really why does it matter? People who build slants do it to be different.