I had a 72 that I did a 302/c-4 swap... it was pretty easy, used hooker mounts and reversed exhaust manifolds.
Used stock rear, never had a problem, mustang II coils, cut off about 1 coil, stock battery location, plugged the stock shifter into the existing harness for the back up lights and neutral safety switch. Had to relocate the oil filter to the fender well with a remote kit. Motor mounts could be had easily from Speedway Motors. Stock trans mount was flipped 180. Used the same driveshaft. It stopped fine with existing brakes and drove well but there was no doubt it had a v8 up front .
I have another 72 HB now with a 2.0, it will not get a v8, ( been there done that)
The 2.0 is just so much fun .