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First off I hope every one had a great Thanksgiving, now down to business, I was a industrial diesel mech for 50 years so I'm well aware of the difficulty in diagnosing with out being there. here are tune up specs, MSD dis. without vacuum advance and a 6AL box, timing set at 34 deg. max advance, it was 10 or 12 at idle remember no vacume advance, plugs are RN10Y .040 gap. valve set .022 int. and .024 ex.. carb is a holley 4160, originally primary jets where 73 and where changed to 68 and plugs look like they could go smaller. Cooling system, CSi elec. high volumm water pump, original instructions said to drill 2 1/4 inch holes in thermostat,I also tried a high volumm ther.both of those things didn't work, currently there is a OEm therm. with 1 small hole in it. Rad. is a aluminum griffin with 2 10 in. high volumm fans. Heres the funny part, I took her for a ride the other day 50 degr. ambient temp. engine ran hotter at highway speed. both fans run constantly.