Autozone had a Delphi AMF003 in stock; I would have had to wait for the Spectra; both matched my truck ('87 Toyota pickup, carbureted, 4-cylinder, 2WD, XtraCab, long bed). I bought the Delphi (the AZ guy told me it was better, came with a lifetime warranty, which it doesn’t), installed it with new tubing and filter.
The idle was too low to keep the engine running at a stop. When I wasn’t accelerating much I thought I felt a bit of roughness, as though a cylinder wasn’t delivering as much power; I’ve blown a plug before, which was much rougher. The old pump had its input on the little can on top of the filter; the new one has the return on top. They’re arrayed in the same order around it. There are no leaks, no other apparent problems.
I replaced the oil and oil filter at the same time. Since the old fuel pump was leaking, I would have thought its idle would have been higher than a non-leaky pump would need.