I gotta be honest.... I've never seen a BB 440 crowd so intimidated by a 200,000 mile 360, with a little more cam. And, who said at 200,000 miles that the 360 has all the compression it should have from the factory?? Who knows what it has.... I don't. I can tell ya, I threw it in and ran 12.9's :) (oh, that was on a hot/humid day) I think in good air, that 12.91 might go down to a 12.79
One thing I have noticed when tearing down magnum 360 engines is how well the cylinder walls hold up compared to the LA motors considering the mileage on them. I think it may have to do with them being fuel injected.