Rear or front mounted calipers! Whats the difference???

Whichever way you go be aware 64-72 lower ball joints are different than 73-76. 64-72 cannot be swapped side to side 73-76 can. What’s more there is a difference between disc and drum in 72 and earlier. 73 up were all the same.
I am using 67-72 b body 10 inch drum spindles to mount 13 inch Wilwood and the spindles are identical.