So whats this kind of swap cost to do???

Lots of 6.1 take-outs available now.....complete trans,motor, ecu,fuel pumps etc, for 7500-8000. Brand new 6.1 block w/ 5.7 heads from Indy are like 7000bucks

Re-program the ecu, make room for the transmission. Everything else is available to buy for the swap nowadays (headers,mounts,rad,driveline)

This thread has answers to all your questions.... http://www.bigblockdart.com/index.php/topic,25852.0.html