67 Barracuda- Brakes and suspension on a 5000 budget- advice needed

They should because you are not going over 4” backspacing on the rims. If you have rear mount factory type calipers check caliper to UCA clearance or ask someone with that combo. When the arm swings out in the back there can be an issue

I know with Hotchkis UCA rear mount factory calipers are an issue
Just for the hell of it I contacted the Tech Support at QA1 and the Tech Guy said
" If your setup worked with the factory UCA's it will work with our UCA. Rear mounted factory disc brakes will not matter".
I have my new QA1 UCA's in hand and over the next couple of weeks we are going to find out, after I finish a little prep and paint on the rest of the componets.
Wish me luck