megasquirt EFI
I'll hopefully have a running MS 5.7 Hemi this weekend, but I took a pretty different path that I don't think I've seen anyone else really even consider. I started my build as a carb conversion with an Indy Mod Man intake and MSD Hemi 6 because I didn't have the money to do FI off the bat. I drove the car for several months before I had an MS2 package fall into my lap at a price I couldn't resist and I was tired of spending money on carb tuning parts trying to get the combo right.
The other big thing to consider with the FI price tag is the fuel system though. Now that I have a job I splurged a little and got a new fuel tank with in-tank pump ($700-800 seems to be the going price) because I didn't want to deal with modifying my old tank and I really thought baffles would be a good idea for a high pressure pump. You can run an external pump (I don't want the extra noise anymore) to make things a little more affordable, but the plumbing will still get you pretty bad. All in all I ended up spending around $250-300 for just the hose and hose ends, and that doesn't even count the regulator I got in my MS package deal (another $60). Long story short, the fuel system costs about as much as the computer, so make sure to factor that into the equation.
I have a friend at work with a mill, so I ended up just buying some fuel rail extrusion and drilling both it and the Indy intake for injectors with a special injector bit, so I can reuse the intake. Things start getting really tight under the hood with the rails and the firewall, but it looks like everything may just clear. I'm looking forward to hearing it run again though, it's been on stands for about a month waiting on transmission rebuild and fuel system parts. It's all wired up now, I just need to get it plumbed.