If the feed you're ingesting is not too long (under 1 hour), all you need to do if feed the NTSC signal into a converter box (canopus) or a DV deck (DSR-45) and digitize it as an "uncontrolled" source. If by "stamping" the timecode, you mean creating a window burn, then just take your LTC feed and put it into a TC window generator (Horita). THis is will create a window burn in your signal. If you want to digitize with the timecode matching the feed, you're going to go through a few more hoops.
I would suggest that you get someone who understands this process to set it up for you. Otherwise, you're going to have a very painful experience trying to "eye match" all of your cuts.
Good luck.
Mark