'63 valiant 4 door /6 cruiser questions.

Greg are you SURE is a 727??? Ill bet its a 904. If not you are leaving a whole lot of HP on the table.
I would get a factory service manual for it as it does a really good job of taking you thru working on the different systems ,etc.
Second set out your budget for the entire car and then break it down into sections. I use the 1.6X factor( if its going to be $100 then its $160) Also be REALLY aware if feature creep.
I started doing a front end job on my Cuda. Brake upgrade, then front end rebuild (you know while its apart) Its still apart 2 years later....
Also watch out on a DD and have a back up plan in place. Remember this thing is 45 years old. And even the best laid plans go wrong..
As for spefics let us know more what you want and what you want to spend.
Frank