Welcome to CHR Brie! Yeah, the engine and trans will fit in the '59 quite well. If my (feeble) memory serves me correctly you can use the 400 motor mounts, then the stands that bolt to the front crossmember from a '68-'72 F-100 with a small block in it. Should be real common item at a U-Pull-It yard. Might have to shorten the stands, can't remember, but once you get the whole thing mocked up you'll just need to drill new holes for the stands. Did a similar swap in a '60 a couple decades back. Oh yeah, trans mount was the same way, rubber mount from the C6, then just re-position the original trans mount and bolt it back into the frame rails. Whatever is rig is donating the engine and trans, you might want to grab the radiator, too.