Swap question

Hello I was wondering if someone can helpe with easy to understand correct info please on a swap?a currently have a 1967plymouth valiant no motor or trans .I to put a mid size V8 4 speed trans and a large solid rear that's easy to pretty much just swap in with minor changes for general street little stip use and ias it possible to run 15inch tires or is 14 it,also what about 2inch headers with dual exhaust what trans and setup also ty and also about braking system and engine bay clearance ty very much for any help