Planning my build. Phoenix, Az need some info and leads.

Sounds like you have a very good grasp on the parts involved. A magnum block is a great choice do to the roller cam. The TF heads would be great but if you went that route coupled with the Sniper EFI you should look into their intake (if available). The Air-Gap intake is great, especially for carbureted engines but with EFI you can use a single plane and it will still be streetable at the lower rpm range. There is debate on the EFI forums about whether and when you can use a single plane versus dual plane and from what I've seen is a single plane and EFI is fine. Typically a sigle plane makes higher horsepower but at a cost to the lower rpm range. Dual planes are typically great for lower to mid RPM cruising and towing. With the better atomization of injectors you can use a single plane and have increased efficiency at lower RPM ranges. If you are using TF heads and Sniper look at their intake or a Super Victor. BTW, your Buick friend may not have the best info on Edelbrock intakes. If you were going carb and even EFI the Air Gap is a great intake for your application. If you stay with Mag heads and don't mind the use of a chinese part the Speedmaster Air Gap style intake (copy of Edelbrock) has a dual LA/Mag pattern.
I have an engine at IMM. Bryan is very knowledgable on all matters Small Block Mopar. If anything I would give him a call and and run your goals by him. He doesn't charge any money to talk on the phone but have your questions lined up. He's a busy guy.
I am interested in your build. Sounds like something I would want to build.