I have a set of ported 305 heads (416) with Z-28 high-rev springs (dual spring design) and all of the retainers for sale. The heads have been ported, had a three-angle valve job and take 1.94/1.5 valve sizes. The heads flow:
Intake Exhaust
.100/64 .100/50.3
.200/126.5 .200/106.6
.300/170.5 .300/151.8
.400/202.4 .400/169.4
.500/209.6 .500/180.4
.600/214 .600/182

The heads have been used and I took the valves and valve locks to use on another set of heads for a 350. The heads are $350

I also have a set of used Comp Cams Magnum roller tip rocker arms with 1.6:1 ratio. They have the center hemisphere and were used with those heads above. The set of 16 will be $100.

If you buy both the heads and rocker arms I will knock the price down to $400. PM or email me at Cory0550@yahoo.com if you are interested. Shipping shouldn't be more than $50.