64 a body drum to disc

I have a 64 dart which I am just getting into I have aquired a 75 plymouth Valiant (Brougham???) it has the disc as well as 318 &auto trans what parts will I need to keep from the donor spindle assemblys, lower control arms, K member?? center link???

You'll need the upper control arms and I'd grab the proportioning valve also. Since it has a 318 with discs, it might also have an 8.25 rear end which I'd also grab. Even if only the 7.25 rear, it'll have LBP axles which could be used. The K frame is too wide for a 64. If the lower control arms don't have a sway bar tab, they'll be the same as your 64. If with a sway bar grab the bar and LCAs and someone else can use them - sway bar won't fit your 64 and sway bar tabs on a 75 are in the wrong place for your 64. Center link won't fit your 64 - if going with the donor V8 you'll need the 65-66 V8 center link. I've probably forgot something - others will certain chime in.