Unibody? On a YJ?
Reinforce a box frame? Oh dear.
Do some reading before posting up very inaccurate advise please?
OP, that is a perfectly doable swap. The 302 is a compact V8, so lends itself well to swaps etc. Power is also pretty easy to get, so no issues there either.
You can make or buy motor mounts, very easy to make.
I always try to use the tranny and transfer case that comes with the donor engines. Lot cheaper that way. Problem is with a Ford swap, the transfer cases are a little big, so a 231 swap would be a good deal there.
I made an adapter for a LSx into a Range Rover, using the Range Rover tranny etc. Looks like this (4L60E bellhousing to a ZF4HP24 tranny)
Not hard to make, bandsaw, drill press, sharpie and tape measure is all that was used
Also made my own motor mounts, using the Rover frame parts and adapting to the LSx plates etc.
Here is some light reading from a very good source
You can use some 9" axles, but some are better than others, so research that one.
A Ford 8.8 from a late 90's (IIRC) Explorer will handle it no problem, and a HP30 can be built to handle comm on sense driving with a 302. Driveshafts will be custom anyways, but 1310 u joints will handle it if needed.
There are also threads in the YJ tech section for this very swap.
I say do it, and keep us posted.
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.