Port my current M1 single plane or install the RPM Air Gap?

Dezduster said
The RPM is on my 72 W300s 408 but it currently has a spun bearing.

That’s a low cost test.

I have an RPM in the box. The guy that helped build the motor says “don’t touch it! “

… as I need to work on better tires and brakes first (chassis stuff). Sound familiar ?