My brother has a 78 w200 with a 318. Hes wanting more power. I've talked him into ditching the stock 4027593 heads for some aftermarket cast iron ones. What's everyone running on here for after market cast iron heads? The EQ sound nice. Would they perform good with a stock bottom end and a Hughes whiplash camshaft. Were not looking to own the street but it would be nice if the truck would get out of it own way.