I've been doing a little reading on such a conversion on a V8.
The basics would be the same for your 302.
Edelbrock makes a conversion kit (Pro Flo 3 EFI) for a 4 bbl manifold. e). They also offer a downstream fuel sump that works with the high pressure fuel pump which alleviates the need for a return line. You do have to run an additional vent line which the article I read taps into the fuel filler neck. You'll have to drill and tap a couple ports in the intake and exhaust manifolds for sensors
Theres a pretty good article in the latest Classic Truck mag covering their adaption of EFI to a SBF.
Holley also makes a neat 4bbl to EFI conversion kit.
Both utilize self learning CPU's that can be customized to your liking.
Sounds like you've got the basics covered.
Good luck
Dave
