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Mark Twain says that history does not repeat, but it does rhyme.
Your issues sound strangely familiar....
You might try opening up the FPR and checking it's operation. I found them to be pretty simple inside. I had two, so switching is a bit easier.
I know that HIFs are not necessarily metered for the B18 and there is no entry at all for HIFs on a B18 in my su carb manual. I wanted to go with BAL needles because they are a bit leaner and probably as appropriate as I'd find for a B18. With the spring loaded needles, I really can't put my HS6 needles in there with modifying or breaking something
The first time I tried to run HIF6, i could not get the mixture to work, but after rebuilding #1 (which was really bad) and following the adjustment instructions closely, I found that a really rich setting was the only one that would yield the correct idle behavior. Leaning them down led to really poor behavior.
Oddly enough, one of my HIF6 pistons also binds up if I remove it and try to correctly. I've never had an operation issue related to piston binding, but it's pretty annoying to try get it in the right dome correctly. I've no idea if such a problem is fixable.
Regardless, the entire manifold assemble is going to be bolted onto my B20E for which the needles will be correct...
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1967 P220 (My every-other-daily driver...), 1971 P1800 (The Parts Car), 1972 145S (1993-1997), 1977 245 DL (1993-1999), 1983 245 (1998-2001), 1986 745 GLE (1997-2005), 1990 740 GL (2003-4), 1995 945 (2005-Present)....
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