[440GP69]

Yeah, Detonation can also be caused by The engine temp being too hot, especially cylinder head temperature, any sharp edges on the pistons,combustion chambers can glow red and cause pre ignition.
Dynamic Compression is your engines actual running compression ratio
Static compression ratio is your mechanical compression ratio ie pistons and cylinder head
Different Types of engines can run More Dynamic compression than others for example
My 5100lb 4x4 2006 Silverado 383 LS based stroker engine is 11.44:1 static compression and i'm running a 9.27:1 dynamic compression ratio 246psi cranking compression Over 610hp at 6500rpm on 92octane pump gas
Now There is a lot of supporting mods to do that LOL!
Your 274 has an advertised duration of 274 intake 280 exhaust i believe, your cams advertised duration is very short "small" even for a small pontiac v8
which means they are closing the intake valve too soon or at least not optimised for your combo, Factory Pontiac Cams had Huge Advertised durations of like 320* versus 274 with comparable duration at .050 and Pontiac would also widen the lobe separation angle to smooth out the idle, bleed off cylinder pressure and Build More Average Power across their usable rpm range,
I don't know your engine specs but i'd bet that cam is your culprit, either that or your timing is jacked to 40* by 2000rpm
To find out, set your timing back to 28-30* and try working your timing back in 1-2* at a Time, if it can only handle 25-28* its the cam Provided all else is ok IMO