Randy and All,
The series is a Slot It or Policar Ferrari F40 vs, the Mr Slotcar McLaren F1 GTR, Specific modifications and rules are yet to be posted.
The issue of the motor shaft hitting the tire can be easily solved by cutting off the motor shaft. You can also run the motor in an inline configuration that will eliminate the problem as well,
If you purchase a Policar F4o you will have to replace the rear wheels with 17×8 or 17×10 Slot It’s as the stock ones are impossible to use much less true the tires.