I'm in the process of rebuilding the 6-pack on my 340 T/A engine and found something interesting in the center carb. The jets are .070 and there is only a plug where the power valve is supposed to be. I believe the stock jets should be .064 and aside from an aftermarket Mallory distributor, the engine is completely stock. I'm curious as to why someone would do that? I plan to return it to stock. The front carb lost seal on the fuel valve, but before that tit ran good, I thought it might be on the rich side, but was going to deal with that after the carbs were done. Any thoughts would be appreciated.