So i did some googling but did not come across a clear answer. Engine is a 1978 350 low compression. I am sticking with standard copper core ac delcos but i want to know whether i should use the spark plugs recommended for the engine when it was running a carburetor or if i should use the recommended plugs from a 350 tbi equipped truck? I am not sure if the different heads warrant different plugs ie (i should use the plugs recommended for my heads rather than the tbi plugs because i dont have tbi heads) or of the whole efi system requires different plugs because if how the fuel is delivered or something? I hope thats understandable. Thanks