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What carb, Holley’s can be hard to tune especially double pumpers. Also could be your cam overlap.
I’m not sure why it would be happening suddenly after I had run well for a period of time. Trash in needle/seat? Start with basics first .
Sets only on rods and jets
Assorted springs ok
742 case, suregrip 8. 3/4
Need at least one spy spider gear would like 2 especially if they are newwhatcha got??