Glowing headers

glowing headers sounds like a vaccum leak
Double-triple checked all ports on carb are capped.
Went through great care installing intake, good fit, should be good seal, we`ll see.


Scavenged some 76 jets from my brothers firebird carb,"don`t tell him" , unwrapped harness, could find no burned wires, all continuity tested good. Forgot to splice in a fuse link, 60 amp from battery to sol. term. When engine died, from pop, I thought I seen a spark near coil area, and that large 8 wire started to smoke and burn where the link would be. I quickly pulled off the ground. That is the only wire that burned.
Question is why would that circuit try to burn up? and what popped to kill the engine? coil? haven`t tested the coil yet, but has continuity from - to +? If any electrical guys are reading this, what size modern weatherpack fuse holder would equate to a 60 amp fuse link? fuse link wires always seem smaller than the wire they protect. Would a fuse holder wire need to be same gauge as the 8 wire? Both would be expensive. Far as I got today hopefully I can refire tomorrow with no drama.