HemiTronix

I had a small block all torn apart to build and put in my car, but when faced with machining costs, rebuild parts, etc it totaled up to around $2200. So I scrapped the idea and started on the Hemi swap. I've pieced this package together and been patient so this is a whole lot more economical then most:

03 5.7 with 04 computer : $600 (no rebuild needed, less than 60k mi)
03 hotwire harness - used plus modification : expected total around $650
flywheel: $86
Clutch ~$150 or so
Clutch slave/master ~75
NV3500 Transmission: $440
Used in tank pump: Free (going to baffle and mod my tank) (some time and welding gas)
Filter/regulator : $40 ish from rock auto
Motor mounts/trans mounts : $30 (making my own)
Oil Pan : Modding mine
Pickup tube $75

Plus a host of misc estimated at around $250 ...

So total: nearly $2300....roughly the same cost of keeping my small block actually cheaper because I included the price of my transmission here and not in the small block price. So all said and done, if you play your cards right and wait for deals it can be done inexpensively.