kingofcoins, I can't help you with gunsmithing questions, ask in the gunsmithing subforum. Regarding your serial number, TVC7046 was used in 1991, TZUxxxx in 1993, so your gun falls somewhere in between.
occ33: Serial number C68xxxx should fall in the period 1963-1965, between C622700 and C810532. The model number stamped on the frame under the crane should be 10, 11, 12, or 45. Barrel length measured from the forcing cone to the muzzle should be 4 inches. If the barrel length is 3.5 inches it may not be OEM. What caliber is the gun?