I was trying to touch on the chamfers in earlier posts, but even so, I don't believe it will make a drastic loss. Some, yes, but not drastic as what seems to be experienced.
Was the trans prepped for using a non-lockup converter? If not, that can add to issues.
Something is being overlooked or is not as it seems, would suggest going over ignition, fuel, etc.
I'm leaning towards ignition or possibly the trans.
Varying all the way to 40 degrees advance with no noticeable difference is kind of a red flag to me.
What kind of distributor, coil, ignition box (if any), and what is the advance curve? Not just total, but the actual curve?
Provide timing for idle, 1500, 2000, 2500, and 3000.
Wouldn't hurt to verify firing order. Maybe show a couple pics of plugs, including brand and part number.
Might as well provide more in-depth info on carb too (not sure what a 'double barrel' is), model number, jets, power valve, secondary spring, air cleaner, choke verified all the way open, etc.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
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