drum to Disc brake swap 1967-72

[stsalvage]

I've been told you can use the stock A arms from a 1967--72 1/2 or 3/4 ton truck just change the spindale is this true and will the 1973--87 spindale work or is the Ball joints bigger on eather one 1/2 or 3/4

Reason i ask i like the stay with the older screw in Upper and lower bushing instead of the press in ones let me know