I don't see where you mention what adjustable prop valve you are using?
As previously stated, usually when a valve is wide open, it provides 50/50 bias. As you 'close' the valve, it restricts the flow to the rears, making it less than 50%. Whatever less it is becomes provided to the fronts. (60/40, 70/30, etc, as an example.)
Start with the valve all the way closed. Then turn counter-clockwise 1 turn at a time, until it locks up, then back it off.
You probably started with it already too far out.
Pics help a lot. Post pics.
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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
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