These are a set of Autolites 3924, motor only tuning. This is a SBF 363 ci nitous motor IS fogger. This was a test on motor, 32* total timing, compression 13:1, TW heads and victor JR ported abd balanced. I put a new carb on it from Bigs Performace, 950 stage 5 for nitrous. I tested like he sent it to me. Front jets are 78 and rears are 85. Base on these plugs do I need to take jet out from front and rear? Spark plugs have 2 full 1/4 mile passes.