I can't really put a number on it, but it will be costly and time consuming. I did it several years ago using all Ford parts (new and used). It not only involves wiring but fuel tank/delivery and exhaust changes as well. I did it the hard way but I had lots of resources for help. There are kits out there but I have no experience with them. If you're willing to do what it takes, the rewards are very well worth it. Having the convenience of a modern car in a muscle car body is as good as it gets. Sam
Sam and I both done it the old way with factory parts. You will be looking at special headers to get the oxygen sensors up close to the motor, new feed and return fuel lines as well as an external fuel pump from a 85-87 pickup. Choice of Speed Density or Mass Air EEC control. One has attributes over the other, but both work very well. Larger battery and altenator plus putting the battery in the trunk. I would use an 87 up 5L roller motor complete. They will be much smoother and more power than the old motors. The other thing is that you will need to learn to be very knowledgeable about Fuel Injection to be able to trouble shoot your installation while installing and afterwards. I can't stress this enough and have been involved with fuel injection since back in 85. Currently run a blown Speed Density EEC controlled car to great sucess that not a lot of others has done. When you start modifying an EFI set up then there are other items that come to the surface like injector and fuel pump sizing. One look at the Mustang boards shows how much of a problem owners get into because they don't have a handle on the tech of the subject. It's really poor practice to guess and just go oversize, thinking bigger must be better but thats what you see. There results are often sh***y to say the least. I know this is more than you ask for but it doesn't hurt to get a bigger picture when it's free..
