If it was rebuilt by one of a very few that do the job right, it was set up on the bench for your motor and should be plug and play. It's real easy to get lost attempting to tune one. And, if the motor isn't healthy, there is nothing you can do to make it any better.
If you can line up dots to install the belt, it's a breeze. Well, you do have to know fuel and oil fittings, etc. I hope you had the injectors serviced as well.
BTW, the rebuilder should have asked what exhaust you are using. If not, that's not a good sign.
Now, if the throttle bodies are all out of adjustment then I take back my statement. The whole job setting everything up from scratch is not easy. I hassled with MFI on a '71S for the few years that I had it. The TB's were a bit loose and the ball end joints on the linkage were far from new. These little things add up fast.
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