the automatics use a flex plate & torque converter
manual shift uses bell housing + flywheel + pressure plate + clutch disk
two different animals
if you swapping to 4speed manual shift & have an externally balanced engine (360) you will need the correct flywheel behind it that is specifically for an externally balanced 360. the harmonic balancer at the front of the 360 engine is also not "neutral balanced", so you cannot exchange the parts with those from 318's, 340's etc.
aftermarket (Hayes, Centerforce, etc) externally balanced billet flywheels are pricey ($300+) so your best bet is to get a flywheel from a 1971 & up standard shift vehicle with a 360
