15 inches of vac at idle

Ran compression test today here is the results 1. 130 PSI. 2. 140, 3. 145 , 4. 140, 5 120, 6 140, 7. 115, 8. 125. Does anyone have any ideas how to cure it. myself just looking I might think rings, except it don`t smoke any. Headgasket maybe. the engine is a 78 360 with indy Xheads with 62 cc chamber however have been cut .20 to true them up. Thanks in advance. I can use any and all help. Forgot to add the valves are 2,02 and 1.60 and the cam is mopar 268/272 duration