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There's no fluid pressure with the engine off so there should be no real issue with towing it a few miles. The clutches are free to spin since there's no pressure on any of the clutch pistons. GD

if this was towed recently, cold ambient temps might also have been helpful?

I have towed our 95 4EAT with a tow dolly 20+ miles with no problems. Then I learned about the FWD Fuse. I put the fuse in, turn the key on and have towed the 95 and 97 both 4EAT's several times with no problems. When I purchased the 97 I used the tow dolly and towed it with the FWD Fuse in and the key on from the Maryland border to central Pa. with no problem except for the battery being almost dead when I got home.

My 2 cents. If you have a fuel pressure gauge hooked into the source fuel line, watch the pressure at idle, 2500 rpm, then after shut off to get some base line readings. Then watch the fuel pressure for 20 minutes after shutoff, it typically should hold within a few psi. If you're feeling frisky and have a bore camera, or even a good phone camera, safely take out the spark plugs after shut off and look inside to see if you can see fuel draining into the cylinders. Good luck.

Don't just throw parts at it. Test. Diagnose. '91 Legacy can still display trouble codes even though it's not OBD II. ASSuming the Legacy that the fuel filter was designed for was fuel injected, than you have an EFI filter. Yes, the carbed EA81 uses considerably less pressure than the EJ22. You should have upgraded all rubber hoses and clamps on the pressure side to handle that. But I'm not asking about pressure, I'm asking about volume/flow. Carter's web site says minimum free flow is 21 (no mention of unit. The only one that sort of make sense is Gallons per hour, but even that seems low). '92 Legacy FSM specs the MPFI N/A EJ22 with a 21.1gph pump at 36.3psi, so on paper that actually sounds low, but since it's meant to supply fuel injected V8s up to 7.5L....I would think it would have enough. You have fuel pressure gauges on inlet and return? What do they say?