You need the v8 centerlink too.
I restored the car in my avatar myself (formula S) and because I got all hung up on numbers matching I re-did the commando motor with the proper high compression Pistons and the the closest comp cams camshaft that was closest to the stock grind (also, I think the smallest cam comp offers for Chrysler lol) and anyway it was un-inspiring. Really. Perhaps if I did a 340 or 360 or A stroker I might still own the car.
4 speed would be super cool though, so keep all that stuff. And maybe the steering wheel if it cleans up nice. They are a nice wheel. And also the steering Column if the valiant doesn't already have a manual column.
Looking at it again the power brakes stuff would be nice to have too, although not necessary on such a small car.
That valiant will be cool when done! Good Luck with all your decisions.