If you're considering EFI and like to tinker/explore/learn, then MegaSquirt is your best choice. I'm currently piecing together my system for a 440.

Auto-nomics ( www.auto-nomics.com ) has bare throttle bodies that can have TPS or IAC installed on them for 75 beans:



Or you can buy an entire kit, minus MegaSquirt controller. It has basically everything you need to get up and running:



There is a VERY informative thread over at www.Ramchargercentral.com that user GunPilot put together chronicalling his journeys into the EFI world:

http://ramchargercentral.com/index.php/topic,84098.0.html

It's only 7 pages, so a quick read, and has every piece of information you could want or need to get a dodge v8 EFI'd. I think three or four other people chimed in on that thread talking about prices and out the door, the Megasquirt system and all accessories are around 700-900 bucks. I think someone found out that the autonomics kit was around $1000, and the current Megasquirt v3 board with the MSII chip is aroudn $250. Can't beat that, I don't think.