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Is it possible the replacement engine has a water pump that turns the opposite direction from the original ? The thermostat has to be open to allow flow thru the radiator, have you tried running without a thermostat to check flow ?
if what you say is true and you have the correct voltage..12v to the pump, then the pump you install is bad or it has a faulty ground wire in the system.
You will need to check for fuel pressure or dirty filter. If you do not have fuel pressure; be sure to check fuses or any relay pertaining to fuel pump (if electric). If fuses and relays are good check or replace fuel filter. If the fuel pump is mechanical disregard fuses & relays and check or replace fuel filter. If this does not resolve the problem then the problem could be the fuel pump if mechanical, If its an electric fuel pump it could be a fuel pressure regulator, fuel pump, crimped fuel line or other wiring issue.
These are the most common things I run across, oh, a crimped fuel line can cause the problem in either case electric or mechanical. Hope this helps in some way, been awhile sense I worked with an older car.
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