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You can't use Imperial or C-body brakes.

The best junkyard disc brake brake swap is 73'-'76 A/E body brakes, or the more common (taller) '73 and newer B/F/M/J/R body stuff.

The 3/8" taller knuckles work fine.

will they work for putting disc on my 70 gran coupe barracuda with drums on it now????

1970 barracuda convert. 1 of 59
1970 pro street A.A.R. clone (panther pink)
1971 charger
2015 hellcat challenger. Redline red
2014 quad cab 4x4 ram 8 speed hemi