Another header question

[240jetjoc]

I have a round port 6-into-2 header of unknown brand with 1 & 3/8ths inch primaries and 2 inch collectors. I plan on using it with my Maxima N47 head. The head has been completely worked by Paul Ruschman (braap on Hybrid Z) including bigger valves, valve unshrouding, polishing to within 1/4 cc per chamber, and moderate porting. The cam is a Rebello regrind with a .520 lift that is referred to as a "very hot street cam". All of this is on a .040 over F54 block with flattops, and running triple Weber 40 DCOE's with an Electromotive distributorless ignition system.

I prefer to run a round port header since the MN47 is a round port head. But I'm not opposed to running a square port header. My question is: Will a header with 1 & 3/8 inch round primaries be large enough to take advantage of a tricked out high compression head (11.2:1) with a .520 high lift cam? The exhaust is going to be a true 2" diameter dual exhaust without crossover, running low restriction glasspacks in the tunnel. Any thoughts would be appreciated. Thanks.