A lot of guys want the Edlebrock heads, but you should bear in mind that the stock Edlebrock heads have fairly small valves. To make them produce equal to a set of built Cobra Jet (Ford iron) heads you will need to increase the valve sizes. If I'm not mistaken the Edlebrocks come with 2.09 intakes/1.60 exhaust. I am currently running a set of old '68 Cobra Jet heads that have been ported/polished and fitted with 2.19 intake/1.75 exhaust valves.
Not sure what the cost to convert the valves would run but even the Edlebrock heads need the larger valves.
I agree with Excalibur on purchasing parts from one of the most reputible builders/suppliers in the field. Personally, I have not purchased anything from George at Gessford, but he has taken lots of time to answer questions I have asked and has provided several tips and tricks. The same for Bill Parnum, Southern Automotive, although I have purchased some parts from him.
Because you indicate engine reliability and longevity is your primary goal, why not have someone like George, Keith Craft, or Bill Parnum, do all of the design and assembly? From what I understand, the FEs are quite different than other engines when it comes to assembly. For that reason, I would defer to the experts. I know it is quite satisfying to build an engine yourself, but the parts for an FE are pretty expensive so I don't think I would gamble that amount of money knowing my own lack of experience in FE engines. Of course, maybe I am just a coward!
Sounds like you would have a heck of a short block assembly. Should provide a really strong base for some pretty good power down the road. I am glad to see you are going with an FE engine. Afterall, the most copied vintage sports car in history should have a correct engine, either a 427 or 428.
Good luck, Bob