72 duster 440 swap

Shims? My car is manual steering and brakes I understand what a shim is but how thick do you use and how do you use them? First car build always built trucks and ramchargers so plz elaborate lol I'm not stupid but a sever lack of a body knowledge if that makes sense
go to the hardware store and get several 3/4" flat washers . About $4.00 worth . cut a slot in each washer the same width as the hole . Set engine on the mounts loose . If something hits , jack up engine and insert one washer per side between the k-frame and the mount . Lower engine and check for clearance . If still hitting raise engine and put another washer in per side . Lower engine and check clearance . If something still hits do not add more washers something else iswrong . If all goes well tighten everything down . The engine MUST be level side to side . To accomplish this the car must be level side to side . Ask me how I know . Good luck and welcome ! Also , previous posts are valid too , start with the tranny attached to the tranny mount .