The 7.3 was a great engine. The 6.0 is also a good engine it just had a lot of kinks when it first came out and had big problems with being chipped. It can be laggy off idle and surge under heavy pedal. But we have had more problems out of trannys than the engines with our fleet.
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2001 extra cab 2500 SLT laramie (dark blue over silver) 4x4 S.O. 55 block, 47re, silencer ring/resonator/muffler are MIA, gauges, big bumper up front, B&W turnover ball, 315 buck shots, and Quadzilla XZT+ (thanks DieselNut)
'89 GMC Sierra SLX 1500 4x4 186K 350TBI w/custom 400 tranny
'06 Freightliner Business Class M2 106 tandem w/lockers,30k# winch, and Altec digger/derrick