Best Bang for the Buck Head???

I know where you'r ecoming from Frosty but RHS cannot be flowed out of the box - they only come as castings.
I agree with Brian - unless you pay someone to do them on the side (meaning not a pro shop) you won't get anywhere near 260 on any bench I've been tested on. Just the valve job is $450-500, then there's parts, maybe guides, spring seats and guides to cut down, and milling. A good set of ported factory iron heads would cost me $1400 with good springs and valves. Any porting would be on top of that. $500 would get me two cleaned and magged heads, guides done, and about 8 valves.