Elevation on a holley??? Maybe???

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Ok guys took my truck up north this weekend about 100 miles. Elevation was from about 1200 - 6000. Yeah on the holley truck avenger. Well in the valley ran nice. Pulled good up the hills at about 70mph till i had to give it more gas. Then it bogged and bogged and and i slowed. So i pulled it in 2nd and it sputtered a bit then gained 15 mph in a couple seconds, shifted in 3rd and bogged again. On the level ran good. I got a 6.5 PV with 15.5 - 16 " vaccume. ??? what do you think
Also i just replaced my 60 amp alt. with a HD 100 amp. around town i can see the diff. in my gauge. Well on my way up with the lights on and the electric fan OFF. my lights dimmed and surged all the way up. only at 3000rpm's or so. whats with that? tnanks in advance.
ohh yeah the trip was a blast got real muddy but not stuck, the gears and lockers go in thursday. then i should see a diff. in bottom end

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