I have not been able to find any solid info on this subject. Is a 1990 305 TBI car engine with a factory roller cam a reverse coolant flow engine? The water pump is a reverse rotation design but does that mean the heads get coolant flow first? I want to make sure if I bolt on my 906 vortecs it won't overheat. I would think if my serpentine belt water pump is not compatible with the vortecs then I can just install the correct water pump and belt setup. Any clarity on the subject would be a great help. I will be running an edelbrock 2116 intake and a carb.