I've been wanting to get a pair of heads for quite some time now and I can't decide whether to go Vortec or to try the Sportsman II from World Products, these of course of for a stock 350 that I just want a little more kick out of, only mods are intake and headers. My question is which ones will give me more power the Vortecs or the Sportsman II's both being 64cc.

Im comparing these two, summitracing part no.
NAL-12558060
WRL-011250-2

Thanks in advance!