Magnum head swap compression increase

whats wrong with the heads that are on the 360
can you do a compression test where it is
else you have to come up with at least one head to match
what are the numgers on the heads you have
I'm starting to entertain a cheap rebuild just to clean up the motor and see what I'm working with. I don't have an issue with the la heads. I could invest a little money in some machine work in them if I really need too. I'm hoping to get a better look at it later this week.