Glowing headers

my 69 hp 383 w/906 having a burn down on my sparkplug boots ends on a chassi swap with chassi headers . and the heat in the cooling system more under control (nu 4 row core n shoud) . the header get blasts of heat do to the cam overlap 470 270 110cl compcam , ing tim 10 btdc . and a rpm eddy int weber afb 600 , stepped up jet and rods , plugs are coffee tune . i've ordered ceramic booted plug wires . had a similar issue when this was in the dart w/ hp manifolds , a metering rod adjustment turned down that idle heat issue . i've nearly jumped 10 percent over what it was to tune for the headers . still tuning on it , anyone ?

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