Gas to CRD is going to cost a lot more then a motor swap, your looking at replacing half the vehicles systems and components... Not worth it.
Check
www.car-part.com for a motor.
I don't know where your located but a quick search as an example i found one in Iowa from a 2002 with 43,000 miles on it for $2,000.
So your saying the block is shot, can't reman it?? I would go with a longblock then. From a few sources online the longblock can be had for $2-$2500 with warranty. You have to transfer sensors and intake and all accessories from your existing motor but its not that bad of a deal.
You still end up with a 02 Rene with a new motor for $3-4k, if you do the work yourself otherwise you will dump more into labor, thats still a steal of a deal.
Otherwise sell KJ in current condition for a couple grand and get something else, i don't know what else to tell you.