But is a cummins swap fairly easy? NO... also need the transmission
Is it really worth it? If you have a dead IDI truck
Should I wait and get a 24v or get a 12v? 12v are just fine, cheaper to mod
I know everyone loves 12v (I do) but I would like to chip it and do some good pulling with it. Buy a whole dodge truck, would be cheaper in the end
Answers in bold above, from someone who's kicked this same idea around.
To expand on that a bit...
If you're 2WD, you're better off finding a Dodge transmission, but if you're 4x4, you'd do better to get an adapter plate to use the Ford transmission and transfer case, unless you want to get a 2WD transmission and a divorced transfer case. Neither option is cheap!
The 12 valve is all mechanical, so less of a wiring hassle than a 24 valve, which has an electronically controlled injector pump...on the other hand, you can't "chip" a 12 valve...however, there are modifications you can make to the injector pump. Many people who are looking for power prefer the '94-'98 P7100 inline pump engines.
And, as BDCarrillo said, getting a Dodge truck would be cheaper, if you can live with a regular or extended-cab truck...although, if you need a true 4 door crew-cab, your only choice is to swap a 6BT to a Ford or bowtie, or buy an '03+ Dodge with a common-rail engine...
Just some thoughts from someone who's also contemplated the swap...good luck with your decision, whichever way you go