A wheeling Jeep is not
an appropriate vehicle for an old-school Boss 302 (unless you're building it for sand drags, mud drags, or similar). Waste of great engine and a potentially great vehicle, IMHO.
Why I feel I'm not completely talking out my ass:
I've stuffed a 351C 4V (same heads as a Boss 302) into a '65 Mustang and it made jack shit for power below 2500 RPM (above 2500, gobs of torque everywhere
The intake ports that you can almost drop a golf ball through and the 2.19" intake valves are made to excel at high RPM at the expense of low-RPM performance.
The old Boss 302 is really a race / track engine, and it kinda' sucks at around-town daily driving. That engine begs to be beaten like a rented mule, and it will reward you when you do, but it is frustratingly "meh" when it's not in its happy place.
Do what you want but, unless you're building a high-RPM race car, that's a stupid engine swap candidate.
I'd love a 302, but I'd do a 5.0L from an early '90s fox body, probably punched out to 331 or 347 cubes and topped with aluminum heads. To me, that would be a very rewarding, compact, lightweight jar of torque for a wheelin' Jeep.
EDIT: if you don't want fuel injection (I get it, my F250 w/428CJ is carbureted) I'd build an aluminum-head 331 or 347 carbureted, but with WINDSOR heads.
Also, if you haven't wheeled with a carburetor, it can suck . . .
Either way, please post photos of your swap!
One way or another, it will be interesting
(photo snagged via google image search attached here to illustrate ginormous intake ports) ↓