Porting 305H.O. heads for 350

I have a set of 305H.O heads on my 350 and I was wondering if I should leave them on or change them out to my original 350 heads #3998993 with stock springs and valves? The 305H.O. heads have been ported, polished, 3 angle valve job, new 1.94 intake 1.5 exhaust valves, high lift springs (good to .510" lift) with 10 degree superlocks and it has also been 350 gasket matched. The intake has also been gasket matched and the camshaft has .470" lift intake and exhaust and 224 duration at .50".

Leave the 305,s on They sould have 58 cc,s stock but if you gasket matched them to a 4.00 bore they now have around 59.5 cc,s witch ismore than stock 993,s. the 305 heads have small runners that will build good torque on a very mild 350 with your cam.