Just butting in a little...
A couple of years ago we ran the "vintage masters" series at York. We ran to rules similar to these mentioned.
Any batteries you like (most ran lipo, but a couple went for period!)
Any speedo (again, some opted for period esc's)
1 specific motor - we went for "saturn 20t sealed can" brushed motors.
These were around £20 at the time and as they were sealed can required no maintenence.
The series has not run again, but was a great success at the time because it was felt that some cars simply couldn't take the power.
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