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After re-thinking the problem, I've removed the engine cover and ebay is helping me with a dry exhaust for the odd cylinder side of the engine. Plan to tune with mufflered dry exhaust and then compare after transitioning back to wet exhaust. Tough to compare apples to apples with prior tune as...

Do any tuners out there have a rule of thumb like “tune wet systems two points lean to get close newbie” or “she’s lean down low and rich up top”

I have Holley hp on the LS7 in my Lund 1950 IO. I tuned it closed loop. Run it open loop and check occasionally. Never looked at spark plugs while tuning. Ran great for two seasons. Pulled the engine to switch the cam from stock to 114 deg lsa 120 duration both lobes. Discovered major...