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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.

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If you only have 120-140 cranking pressure you have a problem.

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Should that not be around atleast 180-190lbs in each cylinder? I used to get 190lbs out of stock 400's.

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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.

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The duration on the Lunati cam he used is 220/226 @ .050." That's hardly what you'd call a big cam. If his pistons are zero decked, I still say he's got an issue. Now, if the pistons are .060"-.080" in the hole...

ETA: I calc'd his combo through an engine program and came up with a theoretical static CR of 7.5 (give or take) to yield a cranking pressure of 132 psi.

The same combo with a static CR of 10.1 yields a 191 cranking pressure and 9.25 dynamic CR. Much, much better...