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Well the first Question is what do you call hot?
The second question is are we dealing with stock engine, Transmission and rearend?
Also do we have a load on the truck?
If it is not stock I think the 350 used a 4 core radiator while the 307 used a 3 core. If you only have that three core you don't have what the engineers at GM deemed nessesary for a 350. Also if you put a different kind of auto transmission in you might actually be running hot in the transmission and transfering some of that heat through your radiator. Also make sure you have a fan shroud on they don't look like they do much but they really help in directing airflow around your engine and through the radiator for proper cooling.
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