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Your A/F looks OK faily stable for the Power you are producing.
its a bit lean in spots We usialy dont like to see anything leaner (Higher) than 12:0 but that is not why you are not making power.
You need a Boost gage. You will never know if your belt is slipping or not. You say it has a High output impellar? They quite make them years ago and SN owners would love to have one. They are called VR4's. They are very rair and It is likely that you have the stock 850 CFM impellar. It will make 7# on a 350 CFM TPI only if you have the right pully ratio and the belt is not slipping.
has your car ever had a boost gage on it that you have sean go to 7-8# ?
The blower puts a big load on the engine. If there is not enough boost and power added then there is no point in keeping it installed.
BTW: Once your engine starts to make more power, then it will be real lean and need a re-tune.
Good Luck
Chad
i have the sn-93 with the highoutput impeller installed i know the vr-4 they stop making them years ago,i will put a guage on it tomorrow ans see where the boost reads.