70 Still getting hot, what else to look for?

340dart.812 said

did you say the engine was built 300 miles ago? if so it still might be tight depending on how tight it was set up during rebuild. The extra friction causes it to overheat until it loosens up. kim is right put a 195 stat in it it will let the coolant sit in the radiator longer in order to cool also what is the timing at idle??

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This had occurred to me, the engine only had about 100 miles on it until I made the 200 mile round trip trek to the track last month. The block has about 40K on it since it was punch out .030 a few years ago. I basically just freshened it up with new pistons etc in 07, so idk how tight it is. Timing is at 12 idle IIRC and 32 at full advance.