1974 dodge dart disc brake conversion

i bought disc brake spindles off 74 a body duster for 98 with caliper can i still use the upper and lower control arm on my 74 dodge dart sport with drum brakes i been look around people saying i need upper control arm

You can re-use your original upper control arms.

ok thanks i was get worried lol im going carry them collision get them sand blasted wont cost me a dime put nice shine black paint on them

You will need lower control arms though depending on exactly what brakes you had before.

They will bolt on your car without issue, both upper and lower unless someone has monkeyed with the uppers.

IIRC, A 13/16 or 7/8" nut on the upper ball joint is a large ball joint.