Welcome to CHR!

First - Thank you for your service to your country. I am personally grateful to the men and women who don the uniform and serve.

Now, as to your engine - we need a lot more info as to what your up to!! From you post, I'll assume (yes I know - dangerous!)
1. You have a block that's been properly prepped to swing a 4.125" crank (my opinion - you be best with a Dart block).
2. You have a big bucket of money....

Now some question:
1. what vehicle do you plan on putting this engine into?
2. What is your rear end ratio?
3. When you say "20 miles to town" - do you care if it takes three gallons of gas?
4. Are you going to run this vehicle at a local track from time-to-time?
5. Is your heart set on a small block? There are several here (Pat and Jerry) who do this for a living and really know how to build a bodacious BBC - just askin..

Again, thanks for your service and welcome to CHR!
Glenn