Welcome to the site Betsy! A couple things I can think of you may need is the 54 style front mount, Y block style Bell housing, (you dont state if your car is standard or auto) Congrats on putting a peroid correct motor in there and keeping it all Ford.
As far as disc brakes go I am a non beleiver in them, every vehicle I have with disc shakes like a SOB when stopping hard, just picked up an 04 taurus as a winter beater and the first attention I have to give to it is new disc in the front it shakes so bad. Drums work fine when maintained well, they never put disc on dump trucks and drums stop them fully loaded.
55 Vicky & customline
58 Rack Dump, 55 F350 yard truck, 57 F100
59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?