I have seen recommendations to use high heat epoxy. JB Weld has a version and that is what I used on my KRE heads.
Once cured, I sanded it smooth and flush with the head then a coat of epoxy primer then paint.
Engine was only run on the stand so no long term feedback from me.
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Michael
Oshawa built 1 option Judge basket case. 463, SD KRE 295's, CNC'd factory intake, Cliff's Qjet, Stump Puller HR cam, RARE RA manifolds, Pypes exhaust, T56 Magnum, McLeod RXT clutch, 3.42 12 bolt. 24 year project almost done... 
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