360 budget build questions.

Try and get your cr up
Looks like 6250 is worth about 1.3 Dynamic compression points. That means you can run at least that much more than a lot of us at lower elevations. To get the dynamic up to the fun zone,youre gonna need about 11.0 to 11.5 static . Wont happen with flat-tops and open chambers. I think KB makes some pop-ups that could get you there.Easy on the cam though. Too late an intake event will drop the dynamic pretty quick at your altitude.
When you go down the hill though, stay out of the secondaries, or risk engine damage.Disconnect/disable the secondaries.It will pull plenty hard on the 2bbl.Consider a dash mounted dial-back timing device.If your gonna run on the edge with 11.5(I certainly would)consider the D-back mandatory.
11.5 static, with a 60* intake closing will get you about 9.5Dynamic at sea level, and 8.25D at 6250ft. The 9.5 is too high at sealevel, for pump gas and full timing, to run WOT. The 8.25 is on the low side for 6250 but will pull plenty hard, and annhilate just about anything at 6250 that is not purpose built.
My combo is right at 10.7static which calculates to 8.8Dynamic,corrected to sealevel.Running aluminum heads,I have no problems running 87E10,Wot,full timing.Generally iron open chamber heads need to run a little more conservative on the dynamic. So at 8.25, you would be about a half point less than me, which should be perfect.
If you run stock type, down in the hole,dished pistons; the dynamic will be laughable(probably sub 6/1 with the factory cam, and less than 5.5 with the 268 cam),and so will be the performance.Stay away from big cams. Stick to the factory 2bbl cam, as to duration.
Spend a little more on the pistons. You wont regret it.Your intake closing point will need to be carefully coordinated at 11.5cr.
Oh one more thing; until you get that 7.25er replaced,stay away from serious rubber.
Oh, another thing, What is your thinking as to the 268 cam choice?
Play with this ; http://www.jeepstrokers.com/calculator/