The MTH item description for it reads F7 B-unit.
"F-7 B-Unit Diesel (Non-Powered) - New York Central (Cigar Band)Cab No.: 1635"
Can the fan section be removed and replaced with the high fan version?
If you look at the phase diagram (not 100% accurate for every unit built in the timeframe), the later 1600 F3 numbers would have been delivered with low fans. So the number is correct to have the low fans. but @SIRT is correct, as the number is incorrect. The F3Bs, as well as all the NYC F unit boosters, were numbered in the 2400-series. (The details for the "F7B" in the photo above are also incorrect, as the F7s didn't have the roof top mesh dynamic brake vents, so its a late production B unit.)
So, to make a long story short, and I didn't want to get into it... There are no as-built road numbers correct for these MTH models.
The NYC didn't have any F3s built for freight using the louvered side panels, they all had chicken wire.
Atlas made a similar error with their first generation F3B units, with the exception that the NYC didn't have F3Bs without the continuous mesh grille along the top of the unit.
Again, I'm sorry.
- Mario
(Edited for corrections - I was incorrect about the 3500-series F3A and 3600-series F3B unit details; they indeed had tall fans and mesh side panels. It does look like at least one of them was converted to low roof top fans and a freight pilot before conversion into a freight unit, but still don't believe that it made it into the cigar band paint scheme.)