Remember the '72 Mach I I have spoke of before? It had a racing dual point distributor when I got it. After I rebuilt it, I pulled an electronic and ignition module from a a '77 truck with a 460. Reason being, hotter spark, more consistent firing, way easier to tune and do maintenance on. I also put on a new cap and rotor with brass contacts again for better spark. It may not appear like an enormous change, but everything about the engine was about making it better, and getting the most out of it for the least dollar investment. The head work and larger cam were the only internal replacements besides rings and crank bearings. It was a very healthy motor when I was done.