TWO LANE BLACK TOP

Had not thought about that Frosty. Could very well be.

You are welcome . Have been doing this along time myself . Hate problems like that sad apart about it is from my own experience usually winds up being something simple. PS Please look at my fresh engine post again put some more on it.

One other thing missing duct work in front of radiator can make third gens run hot by not channeling the air correctly into radiator maybe some of these suggestions will help?

Is this a fresh engine? Are you 100% sure with out doubt that there not crack in cylinder head ? Have built couple of engines thru the years that have had cracked heads that did NOT show up during pressure testing or magna fluxing But opened up slightly when the head is torqued . and engine gets to operating temp.Especially if they have been cut down and the intake and exhaust ports ported and reshaped for max air flow at high RPM the spring pockets opened up to accept larger diameter springs. and running really radical cam profile....Thin walled castings can crawl around quite a lot. Causes all kinds of issues such as cracks in the bottom of the spring pockets around the edges just enough to let just miniscule couldn't even measure amount of water what little there was pulled out by evac system and wasn't getting into the oil only symptom was what we thought was condensation in top in valve cover due to hot engine exposed to cold outside temperature while cooling off after racing 100 laps got to wondering about it put valve cover that was cut open on top watched engine run awhile saw water bubbling up around one of valve springs.If had been street engine without super radical cam profile and matching valve springs and not turning 7500 rpms probably would been OK just an example of things you run into when racing thin wall casting iron head Pontiac engine Was ruthlessly fast though sorry about rambling on sometimes cant help myself pretty sure none this would apply to your problem. SORRY again for rambling about stupid stuff realize this isn't place for it.....

I am in Winston Salem Still think I would look at my fans again just to be sure the air is flowing correctly .Timing would not have that much of an effect on temperature also check carburation make sure not running way lean.Also make sure no vacuum leaks. saw that has new water pump I have seen new water pumps that didn't work like supposed to because of too much clearance between the pump housing itself and the impeller not necessarily divider plate.Excessive clearance will cause the coolant not flow as fast as it should if at all . More common problem than you might think might be worth looking at.

Make sure your electric fans are rotating the right direction you can tell by putting piece of paper on front of radiator should suck up to it. If not rotating right direction just reverse the two wires hope this helps.