The EFI seems to be the easy part, figuring out a good fuel system is the hard part. Being cheap, I just put a sump kit on the stock fuel kit and mounted the pump near the outlet, but it looks a bit funny having the pump mounted so low. On my '69 B-Body, the fuel tank is not very deep, so I'm not sure how the in tank setup would fit, and work unless you add baffles or use the pricy Aeromotive pump with the foam baffle. I think the best solution might also be the most expensive, a custom stainless fuel tank with internal pump and baffles. A remote sump kit, like the Edelbrock one is a nice solution, but finding a place under the hood to mount it could be an issue, and it is also pretty expensive.

I used the Edelbrock XT EFI. It works good, but the control module could be better. They sell an upgrade ECU, but I read they are going to have a newer one than that pretty soon.
Main reason I used the XT is hood clearance, it sits lower than my performer RPM + Holley carb setup.