Track classic have a normal 73 degree ST (54cm), the MASH have a 76 degree ST (medium), a massive 3 degrees steeper, meaning approx 3cm longer theoretical top tube with the saddle in the right position.
Only solution is a seatpost with a massive layback, but that'd mean you'll need a shorter stem than you usually have on your Fuji.
Track classic have a normal 73 degree ST (54cm), the MASH have a 76 degree ST (medium), a massive 3 degrees steeper, meaning approx 3cm longer theoretical top tube with the saddle in the right position.
Only solution is a seatpost with a massive layback, but that'd mean you'll need a shorter stem than you usually have on your Fuji.