[68chevelle]

the only question in going to adress is the carb question. for the time being i would run the same carb as you have on the old engine. when you can i would sugjest having it tuned at the least but perferably sending it to Jet to have them tune it. it should work about the same but as you said with the cam being a little bigger and it running a little rich you might be about right. but the only way to find out is to try it, or call Jet and ask them. they should be able to tell you over the phone what jets they would run if you give them info like cam specs, car, and all the other info that you have to give them when you sent your other carbs off. one thing you do need to realize is that when you send a carb to Jet to have it rebuilt and tuned they do more than just jet it and rebuild it, so if you rejet your old carb for the new engine it probably wont perform as well as if you sent it to Jey but if you had them do this carb that will be going onto that new engine it should be pretty close to perfect still. when you send a carb to Jet they change all the important springs that control opeing rates and sutch things. they tune ever aspect of the carb down to drilling out a few pasages and whatnot. basicaly the only things that are the same when you get it back are the main body of the carb. evrything else has been adjusted or replaced as to best suit the spacific aplication it is being built for. they do the absolute best work on carbs and what they turn out is some of the best carbs you can get.