I went through some of the trouble to clean up / restore and install a '65 tripower over a year ago. I wish I had written all the stuff I did down but even if I had, I never finished so it woudln't have been a tested writeup.
Like Tom said above me, if someone who is experienced redid them for you then you are way ahead of the game.
As for a few tips I can think of that might be hard to track down later - I will say that the Carbking here on the forums is an awesome AWESOME resource for knowledge and parts. He sells a great rebuild kit and is usually more than willing to help you with questions over the phone if you buy his overall rebuild kit (this is not a shameful plug here, it's shameless and for a reason - he's a genuine sage and great guy to deal with).
I remember that carbs off of a 421 engine will have different sized venturi cluster end ports than do carbs off of a 389. (This is for '65, and is for center carb. Not sure about other years or end carbs.)
Also a good tip - It's my understanding that the biggest issue with putting on a tripower setup is a vacuum leak at either or both of the end carbs. These guys don't have an idle circuit so any improper closing / fit of their throttle blades lead to a vacuum leak since no fuel is delivered. What I've heard some people do during initial tripower installs is to use blocking plates in place of end carbs to eliminate that variable at first and to make sure the center carb is working ok (basically making your tripower into the baseline 2bbl intake setup). And once that's all worked out to go ahead and make the end carbs functional and troubleshoot them from there.
Yes with any luck you'll have a well restored setup with no problems but be prepared to work with a few of the nuances in order to reach the goal of what I think is one of the coolest options ever outfitted on these cars :-)
as for my setup... i'm about $300-400 away from the rest of parts I need (sounds like a lot but it's just a few small things here and there that add up)... More importantly I have a 65 setup and a 64 engine so I my manifold won't work with it.. This really slowed down my install :-)
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