Always good to state the actual intake centerline in discussions. The words "straight -up", "advanced" and "retarded" have different meanings to different people.

What engine is this going in? That cam will rpm a lot different in a 383 verses a 510.

I'm not too sure that 6500 is even achievable with XE cam's in any motor.

I cannot say if putting that cam in at 104° is right for your set-up. It could be. But if you've never run this cam and you think you should run it at 104° (what I would call 6° advanced), maybe you should consider a different cam.

If you think a hydraulic cam in the 240° duration is right for your set-up, I would also suggest looking at a solid flat tappet cam.

At the end of the day, there is nothing wrong with running it at 104°. It's your call.