What motor do you have now in the 64?
If a 289, the motor mounts will work. Not as sure on teh trans mounts, but that shouldn't be too difficult.

the pedals are the same 60-64 galaxie, so yo shold be able to find them. The 302 bellhousing is larger than the 289. not a big deal, but the automatic on the column linkage uses the bellhousing as a pivot point, and that won't work with a 302. Hydraulic clutch would be the easyest way to go, hardest part is mounting the master cyl.

Other comments i agree with - no mech fuel pump boss on 302, buta holley elec pump will work with a carb just fine. If you are keeping the EFI, then you'll probably need 2 lines from tank to engine (feed and return) and have to modify the tank "hatch" to accept teh extra line. Not positive, but i would think you could get a fule pump that puts out enough pressure without having to go to teh hassle of an intank mounted one.

as to computers, many people have put them in old cars. I might be very tempted to go to an alternator and modern regulator if i was a puttin a puter in there.

let us know how it turns out!