There has been several occasions that a properly tuned VCT motor has made more power than one with a VCT delete and adjustable gears.
But yes, you cannot run standard zetec cams on a VCT motor. The journals are not the same size.
FocusXtreme - Hatch Nation #96
04 ZX3 5.0, T5, 4 lug 7.5 w/ 3.73s [3/13 ROTM] ["Best Non-SVT" FITF '12]
12 SE Hatch Sport & Winter Package, ST Front End
91 Ranger XLT 3/4 drop
89 Bronco II XLT Well the body is still stock, what's left of it
97 Mountaineer 5.0, AWD, 3.73s