Any 302 or 351 will almost bolt right in. uses the old radiator. modern engines upto about 400ci are actualy lighter and smaller than the origional 312 those cars came with.
Use a 86 mustang motor mount or a ranchero. plus a small spacer block.
I've seen upto a cadilac BB but then there was a LOT of cutting involved.
Lincoln Mk8 rear disk brakes work they are easily hooked upto the old parking brake cable. You'll have to make up adaptor plates.
To make the Granada front spindles work all you need do is retaper the lower ball joint hole to fit the old ball joint. The same taper for the tie rod ends. After that they just bolt right on.
Disk brake mastercylinders work from mustangs with little modifying, the same with some lincolins.