Magnum heads on a 74' 318 LA

I have done 2 LA to Magnum swaps and have been very happy with the results on both. 1 each 318 and 360.
Im about to do a 302 head swap onto a 318 that is older than the 302 heads.... I will see. Fresh from the machine shop, IDK if they did any porting or such, Im afraid to try as I don't want to screw up their seat work. I DO know that they came back to me with 16 new valves.