That would be quite the project. I picked up a used Edelbrock Pro-Flow EFI. The blower with the EFI gives unbelievable power and reliability. EFI is a very cool improvement on a vintage Mustang...

 

on your setup how much of a gain did you get. is it worth the time and the money or no.

 

The manufacturer claims anywhere from 50 to 100 horese gain. Of course, that is highly conditional on a lot of other things. I've not put it on a dyno, or been to the track since I've had it installed. However, I have taken it on a cople of hundred-mile trips on fairly desolate roads....and wow...60 to 100 is sweet.......................