new radiator... still hot

[courage 80]

I recently was given a 65 step side from my father in law. The owner before him put a 350 from a 74 pickup in it. I have rebuilt the carb, and put new a suspension in it.

I just replaced the radiator with a new one from autozone (it is a 3 row). I told them that it was for a 65 c-10 pickup; HOWEVER, I forgot to tell them that it has a 350 engine. They put in their computer that it had the V8 ( but the only option for it is a 287 not 350)..... I just did the install today and figured that the 3 row would cool sufficiently since it only had the old half clogged one before.

I also replaced all the hoses, thermostat 190*, and the radiator cap.

I let it warm up and then took it out for about 15 min. The needle went all the way to the (H) and then stayed. It didn't overheat, but I didn't push it to see if it would leave me standing there.

SO, I guess I am wondering where to go from here. Thanks