Compression Test on my 318, not good

did you run a compression test after installing the engine the first time to have a base line .also did you use stock pistons, a cams shaft with a large duration or wide lobe separation will lower the compression by 30 psi .I had one 318 I replaced just the cam in it and the first thing noticed was a lack of starter noise (wine) so went back and the compression was 150 before cam and 120 after cam swap.so what I'm getting at with the engine sitting that long it could take 1000 miles to reseat the rings there could be nothing wrong at all.