Any way you look at it, the cheapest way to do ANY engine swap, you first have to decide what powertrain you want in your Jeep, then stick with that. no matter what.
Then you have to make sure your driveline can handle that power. If you are still running the DANA 35, your best bet there is a Ford 8.8 out of an 96 and newer Explorer.
Figure out what year, make and model your powertrain choice came with from the factory. Buy an entire vehicle complete.
Figure out what adapters for: motor mounts, cooling system, fuel delivery and driveshafts you will need to make it all fit together with decent driveline angles.
Check out Novak, Advanced Adaptors and JBconversions for your choice of adapters.
AdvanceAdapters.com | Engine & Transmission Conversion Adapters - Advance Adapters
JB Conversions, Inc.
Novak Jeep Conversions - Home
ALSO, Check our vendor section for potential deals on adapters, they seem to have a running deal going on Tcase SYE and driveshafts.
What adapters are not available? work out what modifications can you make to get your choice to work, and what would you have to PAY someone to do.
Thats the easy part, now you have to figure out wireing, where do you want the computer to sit? Do you feel confident you can mod the wireing and computer yourself? or do you need to pay someone to do it?
Do you live in an emissions state? If so you need to make sure your mod conforms to this equation:
Donor drivetrain = your Jeeps model year or newer
Donor vehicle emissions components transferred to your jeep
MIL working correctly
Aftermarket parts that effect emissions approved by C.A.R.B. (in most states)
For cali, after you are done, you have to visit the referee, he issues a new sticker with the year of your vehicle, the year of the donor engine, and what components are required, future smog checks will have this sticker entered into the smog machine to eliminate any discrepencies between your car in stock form, and your new drivetrain so the state doesnt go into shock because its different then stock.
This might be similar in other states.
The easiest conversions out there and GM V8 and V6 drivetrains, there is more aftermarket support available for those conversions into your Jeep.
Check out the builders section of our forums for options and potential solutions to issues others have had.
Though its not wranglerforum.com you also might want to check out other Jeep forums, and Pirate4x4.com for more potential solutions, there is a WEALTH of information available on the internet, take FULL advantage of it.
This is true for ANY engine swap in ANY vehicle (only Jeep specific part is the Ford 8.8 part) . if you want more information, you have to give us more detail about your Jeep, and your expectations.
Year, transmission, and gear ratio in your Jeep is a great start....