Years ago I changed a 66 falcon over to 289 from 6 cyl. Used a 8 in. rear out of old 65 mustang plenty stout for small block ford. Took front drums off also, Same size backing plate and brakes, bearings were same size, just slid over stock 6 cyl. spindles adjusted brakes and was on my way. Never had any problem with them. Hope this helps some.