best flowing iron heads

I would try RHS heads, they make a iron head that flows good.
thanks for the tip, their 180cc head has very impressive flow numbers, flow at .600 lift is similar to afr, but flow below is way higher, would make for a super torque-y motor I bet.

If you can find a set, old school TFS Street Heat/High Ports.
forgot about those, bet those are pretty hard to find