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When I did a top end on my 3.2, the leak down was about 10 percent before I ran it, very minimal after break in with 180 psi compression test. It had nikasil cylinders and new rings. New valves and guides were also installed.
I would want more information. I would want to know what this professional rebuild consisted of. Were new pistons and cylinders installed, was the top end done, was the case split for new bearings? Did they change any head studs.
Also, are the cylinders nikasil or alusil. If they are Alusil and all they did was new rings, this is not a rebuild, and can cause issues if they used old cylinders and just put in new rings. Re ringing alusil can be very problematic.
Without some documentation it is just a used engine. Hopefully the shop can give you some good information after they run in the engine.
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Ed
1973.5 T
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