Yes sir , I run the GSS340 in my '92 S10 , It has been there from the beginning , TPI350 , Carb 383 , now a TBI 434 . Absolutely no fuel pressure problems.
I have the E3270 in my Blazer with the TBI 496 as it what was in stock when I did the tank , no problems there either .
Before you say they are TBI , I run more TBI pressure than most ................ They work.
Be sure you get the filter sock for the Walbro if you go that route , it is larger than stock so a different filter is required , the bottom of the hangar needs to be "massaged" a bit but fit and function is fine.
TOM
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