The way it's behaving sounds more like fuel to me.
You've set the float heights using the windows or ports on the holley?
The only reason I would think it's spark is if something is moving when you hit the brakes or turn, but it seems unlikely.
Backfiring when you release the throttle sounds like lean popping (possibly low float height).
Hard to start can also point to low float height.
Cutting out around corners... again, float height.
Are you sure it's right?
Haven't checked the floats yet - was going to use the ports method.
Was going to do that first but the mechanic got me thinking...
I spent half my money on mustangs, mustangs and more mustangs. The other half I wasted on mustangs - and an Effie.
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