2% out of position penalty, and an additional 4% for each move in a harder direction for FLD
10% out of position penalty, and an additional 15% for each move in a harder direction for RRF
If you're looking at 1972, a B- FLD at 3B is .953-.954 range, so a 2% hit would make the FLD .934, or about a C- for 1972.
A- Range for same season is 3.30-3.40, so a 10% hit would be 2.97-3.06, or a C-C- range for same season.
Since going 3B to OF on WIS spectrum isn't increasing difficulty, you're not taking the additional movement penalties.
For that season, you'd be looking at a B-/A- 3B playing like a C-/C- OF.