Think you will find that with a true return regulator that you should use at least -8AN return. On my drag car even the -8AN return line created a 6.5 PSI back pressure. Going to a -10AN line lower that to 2 PSI. Anyway, if you do use the -6AN return line, don't be too quick to blame the regulator if you can't get the pressure down with the adjustment screw.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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