Would the 180's be better for the XE 274? I've just recently sold my last 350 and it had 3/4 port, polished and gasket matched 305 H.O. heads with 1.94 and 1.5 valves, gasket matched performer intake and a magnum 270H cam in it bolted to a 700r4 tranny, don't know the power range of it but it would smoke the tires through 3rd gear with no problem