Increased power for Chevy 3500 Class C

Some sage advice here! I'll forget about swapping for the big block. As some of you have suggested, what I find annoying is having to run at high revs to climb steep grades. I suppose building up the 350 won't really let me climb grades at significantly lower rpms - that would require more low end power, which one generally gets from greater displacement. That's what I hoped to get with the 454. Stroking from 350 to 383 or so might help some, but I'm not sure it would be worth the cost. Maybe I'll just look up the power curve for my engine and get a tach to ensure that I'm running at the best rpms on the climbs (shifting manually, of course, which I already do). Oh, and I'll feed the squirrels that run alongside, as suggested.