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Q: engine backfires when rev'd really high? on 1990 Chevrolet Blazer

hello,
The vehicle is a carburated chevy 350 K5 Blazer
Starts and seems to idle fine, It is set to 8 deg. BTDC. When you first start to rev it up it acts ok. When you rev it higher or get on the accelerator it stumbles and there is some backfire. What causes this? And what should i be checking for?
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