bung in head intake

Very creative use of existing and cheap parts. EMT is cheap and welds easily. The galvanizing just vaporizes away (respray w/ high-zinc rattle can). I am currently using it to fab a carport roof (plus old trampoline tubing). Does an EFI intake need exhaust heat? Many modern engines use plastic intake manifolds and I don't see any provision for exhaust heating. But, you do need to seal the top of a factory slant exhaust, and it does make a structural support for the intake, as you noted. Rather than machine the damper pulley for a 36-1 wheel, might be easier and better to use a bolt-on power steering pulley, which you usually find on later engines. It would already be fixed to the crank hub.