Strut rod bushings

I am using a DC big block spool mount k-frame and putting 73 upper/lower control arms/disk brakes on the car (69 Dart). The strut rods I was going to use were the original ones from the car (biscuit k-frame and drum brakes) as I didn't know the design changed on the 73-up. Can I use the originals or will I need to use 73+ strut rods?