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Well...
Do you have the fuel pump wired via a relay so it receives pure 12V+ power at all times when the key is on? Or is it running through the 20+ year old crusty corroded wire and not likely supplying adequate voltage?
That's where I'd put my money. Unless you bought an eBay Walbro and got hosed by one of the many eBay vendors selling cheap pumps as legit walbros. (Very common)
Your fuel pressure should be factory regardless of your "setup" as that is what just about every injector is tested and meant for (3 bar fuel pressure) unless you happen to be running 4 bar pressure which is very unlikely.
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