It's been done by many others and is fairly easy, relatively speaking. The parts needed are all out there, just takes money. Just a few thoughts:
* Will need new k-member (and mounts)
* Will need new trans (and rearend, as you have the 7 1/4 rear axle)
* Will need to upgrade front suspension to handle the added weight (and rear springs)
* Brakes, of course will need to be updated (don't forget the brake booster, etc.)
* Radiator again will need to be replaced
* Engine compartment wiring will need to be replaced (better than mod'ing 40 year + wire)
* PLUS....many, many little things that always come up when doing an engine swap.....
ALWAYS: plan on more time, more work, and more dollars before it's all done.........
FYI: Do your homework, and don't take anyone's "word" that something will work.
Example: Many years ago I swapped a 350 in place of the 305 in my SS Monte...
Everyone told me that the exhaust would bolt right up.....wrong....expensive lesson
for me..............just a word to the wise.....