Re: air/fuel ratio vs cam/lifters?
Mark, IIRC - you're running a carb, yes? I thought you bought a Weber for your rig.
A few dumb questions...
1. Timing chain marks were right on the dots - true?
2. Distributor lines up with number 1 and firing order is 12345? (check it)
3. No vacuum leaks? (good idle)
4. Timing advanced enough? This may be the issue. since your engine is carbed, I usually advance the timing until the engine pings, then retard until the ping is gone. I rarely use a timing light.
5. And very important - rockers adjusted correctly? If any are tight, you won't have good power.
Best bet is to adjust them with the engine running. They will pump up and you don't have to do the "extra" 1/2 turn routine. Back off until clatter, adjust until noise is gone. Works every time.
Even at higher altitude, you should have low end power.
Hope this helps...
Confucius say: Truck who live in mountain breathe hard...
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.