Hmmm... You raise a good question:
Will a 455 cool correctly with an 8 bolt water pump. I assume that you did this so the pulleys, etc.. will line up.
Most of the time, if you are moving and it runs warm, that is an indication that there is not enough coolant flow.
If it was at idle, you need more air over the rad.
Whats the t-stat temp?
You could richen it up a little. If it starts to run cooler, then you do have a vacuum leak. Also could spray water near the intake to see if you a vacuum leak.
HTH,
Dave
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1967 Pontiac Tempest 2dr HRDTP Coupe 468 C.I. 500 HP 5 speed = FUN!!!
1990 Chevy Suburban R2500 Daily Driver
1986 Volvo DL245 Wagon.. Project car!!!
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