231 advice and info needed

[MUDWEISERJEEP]

Hello everyone. New to the board.
I have a 1970 Jeep CJ-5 with a 231 buick V6 that I installed a couple years ago. Jeep originally had the Dautless 225 V6 in it. The 225 went bad and I didn't have the money to rebuild so I swapped it out. I got the 231 for $100.00. I was told it was out of a 1979 Chevy Monza. Has run great but I am getting antifreeze in my oil. I am planning on replacing the head gaskets.
I did a compression test last night and here is what I got.
#1-119 #2-115
#3-110 #4-120
#5-95 #6-115
What do you guys think?
Does anyone have a gasket set part number?
I am looking forward to all replies and learning more about my engine.
Thanks - Tim

[MUDWEISERJEEP]

Another question - Is there a database that would have engine casting numbers so I can verify my engine?

[BigRivy]

Number 5 is obviously low. You want all cylinders to be within 10% of each other, which would would be 12 psi if your highest cylinder is 119 psi. You need to find out where it is leaking, rings, valves, etc. If you know you have a head gasket leaking you will probably not get accurate compression test readings. Put pressurized air in the #5 cylinder while it is at TDC and see where it comes out at. In the pan means bad rings, In the intake or exhaust it means a leaky valve, bubbles in the radiator means bad head gasket. Try to figure this out before hand and plan your repairs accordingly. It's a waste of time to throw in head gaskets and then find out you need a valve job or the rings and cylinder walls are worn out. Also I would closely inspect the camshaft for wear when you have it apart. Leaking antifreeze really does a number on the cams and crank bearings in these engines. As for as part numbers go, I believe that is what they pay those guys behind the counter at the parts store for. Don't use Jeep for the application when asking for parts, try your best to figure out what the engine came out of and use that application for parts. Good luck.