Build/Restoration Opinion?

If you happened onto a 72 Demon, slant with buckets, 3 speed on the floor, no console, original tuff wheel and the original set of rallys still on car, would you leave as is or would you palce a 340 in it and clone it? Would you switch to a 4 speed and remove the 3 speed? Keep in mind value in the end result is a factor. Would it be worth more cloned or left original? I think i've found one.
Small Block