471 Big Block high rpm problems

I dont have fixed in car afr sensor, but I have an external sensor that you put into exhaust, hook it up to a laptop and see your values there.
I will check it again, just need to fix my transmission.

Lobe separation: 110
Intake centerline: 106
Duration Intake: 284
Duration exhaust: 296
Duration intake @.50”: 240
Duration exhaust @.50”: 246
Valve lift intake: .507
Valve lift exghaust: .510

I am using it with 1.6:1 rockers so valve lift is:
intake: .540
exhaust: .544