Rebuild my org 440 this winter.
Now detonates over 4800 RPM?
Any help appreciated to solve this problem.

Engine specs:
KB237 030" block 0 decked
Moly rings, top ring filed to KB spec
906 heads, 2,14" and 1,81", hardened seats, shaved to 84cc.
Fel Pro 8519 PT-1 head gasket 0,029" thick
10:3 comp ratio using KB calculator.
Lunati voodoo 60303 hyd camshaft
Champion plugs RJ12YC
Rocker shaft shimmed for preload
Stock dual point distributor, petronix ignition, total ignition at 2300 RPM
Stock HP exhaust manifolds, with repro mufflers and pipes.
Under 4800 RPM runs strong and great, idle 900 RPM,vacum 15 HG, 16 degree ignition total 36.
Gas unleaded 98 octane (sweden)
Have tried to set ignition down to 10 intial and total 30 without any result.

Carbs stock 1970 auto
Center 64 jets, powervalve 65, shooter 31. fuel/air set with vacum guage
Front stock metering plate 34R-6153-35
Rear stock metering plate 34R-6153-35
Front and rear fuel/air set with blocking outer air bleed holes.
Still detonates over 4800 RPM

Changed metering plates in front carb to 34R-9716B
Have no idea what size it is.
rear carb 34R-5113B size unknown

These metering plates was mounted when car had a mech camshaft, Racer brown. pullig hard to 7000RPM.
So i figure they give more fuel than the stock plates.

Finally checked the spark plugs, they look to white for me, want a more tan/brown color.

So here is my question:
Is my engine running lean above 4800 RPM and cause the detonations.
The voodoo 268 camshaftit should rev to 6200 RPM.
any idea what size jet to use, if thats the problem.

Or do I need to change to a thicker head gasket?
Or change heads, build a Quench engine with the shortblock above.

Want to run the car on the strip this summer.

Long story, hope to get some input on the detonation problems I have.

Thanks Peter