I just got my 1966 Chevy truck running earlier and am not pleased with the performance. When I give the engine full throttle from any speed and especially low rpm it falls on its face. I have a feeling that it has to do with the timing and the carbuerator. ( the carb is off of my 85 mustang and is a 600 cfm holley) I am not sure if my timing is right on because I do not have a timing tape on my balancer as of yet. So......when I decide to jet the carb how do I know which way to go? since it was jetted for a smaller sized motor....should i start out going bigger? How am I supposed to know the air/fuel ratio I am at??? any help would be appreciated.