Kentville-
I have recently had seven different mechanical fuel pumps
in and out of my 1968 TR250 block before I got one that
worked correctly and produced the correct psi of fuel.
Paul Rego's rebuilt OEM pump.
The good Lord knows, I'm not claiming to be a fuel pump
expert but all 7 pumps fit into the engine block
opening (without a spacer). All 7 pumps required a gasket.
Look at the new pump side by side with the old pump.
If they look real similar- try to install the new pump.
If it installs easily you probably have a winner.
If the psi tests out good- you've got a keeper.
Even this know nuthin' mechanic is able to do fuel pumps.
BTW: Make sure you install a hard wired, electric fuel
pump as backup. My experience has been the mechanical
fuel pumps have a high failure rate and give no notice
they are about to fail.
regards,
dale.