If you remove the vacuum pump, make sure you just don't pull it out and throw it away! The vacuum pump is driven by the camshaft, and the vacuum pump then drives the oil pump. In order to delete the vacuum pump, you need a block-off plate with the built-in oil pump drive mechanism. Most vans with the 6.2L used these.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter