So, I changed out the plugs, went to a lighter advance spring, installed the new Brawler 850 double pumper . No more backfire, four corner adjustment responds well, and car sounds strong . Still need to fine tune as exhaust a little stinky and car still has what I would call a lean shake with timing jumping a little.
Thanks to all who have been making excellent suggestions, I really appreciate the knowledge that you all are willing to share.
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