It depends on what you want from it. Personally I have an XE268 in the 360 right now and I don't like it. If I had more compression and cubes it would probably be just right for me. I had a custom cam cut for my motor similar to yours and it is a 231 @ .050 .514 lift and I am scared I won't like it. I like a smooth idle and lots of TQ and if it won't go past 6K I could care less.

I can not find an XE286 cam so I am thinking you mean XE268.

If that is the cam you are thinking of useing you should be fine at that compression, the magnum head is very detonaation resistant.