Hey guys,
I have a ‘57 3200 with a rebuilt 350, topped with Carter AFB Competition Series 9635S, pushing a TH350 tranny. On occasion, it surprises me at a stop sign with an engine rev of probably 1000 rpm. A quick shift into neutral drops it back to normal. Does this sound like a vacuum problem or could it be transmission related?

1957 Chevy 3200
Daily Driver
PS, A/C, Tilt column, Rebuilt 350, Rebuilt TH350, Reupholstered Bench Seat, sound proof/insulated, LED headlights/taillights/backup lights/interior courtesy lights.
Follow in the DITY