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I got 120-140 psi (not bad according to FSM) and no leaks, but the car is slower than it should be with stock 383.
If you only have 120-140 cranking pressure you have a problem. 
Should that not be around atleast 180-190lbs in each cylinder? I used to get 190lbs out of stock 400's.
If the stock or near stock compression pistons were kept it place and that higher lift and more aggressive duration cam were used, cylinder pressure will be somewhat diminished, which would read with lower compression readings, although not necessarily 120 psi low. Maybe 20-30 psi lower than stock.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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