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.
All of the above plus the rest of the car is also important,. A 3000# car with 4.10 gears and a good converter might love that cam but a 4000# car with 2 something gears and a 12" converter will likely hate that cam. Advancing an extra 2° won't fix that.
1970 Dart Swinger, 3:55 posi, 2800 stall 727, 3" mandrel stainless to the bumper, mini tubs, 275/60 15 bfg's
I don't have a weight measurement of the car yet but I know that the 440 with aluminum heads, intake, water pump and housing, and headers weighs less than the stock 318 with P/S, A/C, iron manifolds ect., plus I removed a/c and heater boxes, power steering, all A/C components, swapped the 150# bench for seat very light import bucket seats.
I'm guessing 300-400 lbs less than stock.
