All of the later model F-104 X series cars are built to accept brick style packs
Most of us run the shorty packs
I prefer to run the pack forward at all times, foam or rubber
F-104WGP
F-104vII
The kit supplied 93T spur works with 64p pinions
Pinions from 30-35t is the range with 21.5 blinky at most tracks on rubber tires