It could be done. IF you sell the 6.0 parts and take your time it is possible. You will not have a race truck but it could be done.
I was only out of pocket $100 in my conversion until I decided to replace the tranny now I am in it for $4500. I did have lots of cummins parts I sold and 6.0l parts I sold (still have the heads) but I had lots of cummins parts to buy converting my motor from a medium duty 5 spd motor to a light duty auto motor. I did spend 2 years on my swap and it is still not dialed in yet.
Lets see the parts you will need to get/fabricate to get this to work:
Motor Mounts $325 or fab your own.
Alternator bracket $169 or used the dodge alt and add a regulator.
Tach kit $249
Radiator hose kit $179 or make your own
Down pipe custom made $????(I used the aluminized 6.0 CAC tubes)
overflow catch can coolant $50-$100
CAC tubes $139
drive shaft modification/ballance $300-$600
hydroboost line mods Custom hose $60-$100
oil pressure sensor from a 1996 F250 gasser $8
modify fuel lines $100
ps, tranny fluid, and oil+ filters $???
Tranny cooler hoses custom made $200
modify your xmembers and skid plates $200
Time, lots of time $????
the cost of converting to 5spd. ????
There may be some things I am missing but this is a big chunk of it.
You have the dodge to get parts from and you will have the 6.0l to part out.
Is there anything else I am missing?