The valve lash can effect results. I would compare cold lash on your high and low cylinders. Even If lash turns out to be the same those numbers look good to me for an engine that hasn't run for a while. Maybe someone with more experience will chime in but I expect your numbers to be better after you blow the cobwebs out of it by putting few hundred miles on it.

I'll second that. Adjust the valves first. Running the engine will increase compression in an engine that hasn't run in a while. I've had an old engine test 90-120 psi, ran it, retested, and got 180-195 across the board.

I adjusted the valves (cold). The intake were < .002 instead of .008 and the exhaust were .012 instead of .010. Compression was improved:

Before adj/after adj

120/135

135/140

125/125

115/??? (still got the 200 that I got from pouring oil into the cylinder during the first test)

130/135

125/140

Fell free to comment. I will probably do a leak-down test and if all seems good, I will go with it after changing the stem seals and see how it runs and tests after getting some time on it.

Is there a way to tell if it has hardened valve seats? It is a 260 motor and E88 head with E30 cam.