Help me put "587" heads on a 318

I think better options are out there than using 587 head. Find a set of 302 heads and do a home port job on them that is in the sticky section. Even doing a port job on your current 318 heads would probabally be better than using heads from a 360. Larger chambers&ports on a teen will soften the bottom end up especially if the car has a tight converter and highway gears. If it were me, I'd work a set of 318 heads before using the 587's.