super stock sbc heads
 

If building a NHRA superstock 300hp 350, would it be better to use the aftermarket heads like the RHS 12402 or the 041, 492, 461 heads. ported of course. I don't know the flow numbers of the RHS heads but they have 172 cc intake runners vs the 165 for the factory heads 1.94 valve sizes. i know the factory stuff can probably flow 265 to 270. but don't know what the other aftermarket heads with increased intake runner will get.
thanks for any input