Ok I have done this a few times and it will give u a guide only, best way is leak down test but you can do a comp test turning by hand with all plugs out , u get tired easy and I find the first two jumps are what u should look at And I managed 100 psi by hand , just remember that on the starter ur turns at a few hundred rpm by hand it's like 4 and there really isn't any other way around it but like I said it gives u a guide. Once the engine is in I comp test before starting and so far it has worked out ok.
Scott