Any FORD/MERC of that era (1968/1970) would be the easiest to take the parts off of. A later FORD or 73/ TORINO will also work, but there may be a problem with ball joint/tie rod end wedge ends. But, they (spindles) can be machined to accept the earlier suspension parts or you may just be able to switch different year parts around to get the end result.
You have several possibilities. Just don't forget the master cylinder and proportioning valve upgrades also.