Are the timing marks on a Vortec , 350, timing chain cover, which doesn't have the #'s 0, 2, 4, etc, be the same position as a 92 350 block? Done a swap with the Vortec, TBI, GMPP intake. Voretc motor was, according to numbers, built in late 99. Did not change the cover, old sensor in, to plug the hole. Thanks