Nice project. Two things I would suggest since you are getting that involved. #1 is boot the old wiring/electrical system. Old electrical with sketchy connections/grounds etc don't play well with EFI. Time for some updates and add a bunch of grounds, replace switches/senders/sockets etc. #2 is if you are putting frame connectors in, do them with the drivetrain out and the car gutted if you are going to use a two post lift. When using a two post the car sags when you lift it and its fully loaded which causes door problems if you put frame connectors in. If the car is empty it won't sag on the lift. And having a ragtop makes it an even bigger issue with the sagging. If you can't empty the car out, use the lift to elevate it some and then set the car down on its wheels with them resting on some tire stands and make sure the doors work. That way when you do the structural, the car will be loaded/doors can open close normally and you won't have to fight the sag issue preventing normal operations of the doors. The picture shows some of the stands I built being used to support my deck while I was working on it. To give you an illustration of the amount of sag you will experience, jack the car up on the front and put jack stands under the car where the lift pads would be on the front, roughly the front frame rails and t-bar crossmember junction. Set it on the stands, let the jack all the way down and TRY to open and close the doors. With all that weight and no roof structure its really going to sag.
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