Hi Matt!
They can both handle lipos and brushless motors provided you used an ESC(electronic speed controller) which support them (most do)
The only issue you may come across is fitting a lipo battery in one designed for Sub-C cells.
NiMh battery packs are still readily available and mega cheap! When these two cars were sold, the best packs gave you 1700mAh. We're now upto 5000!!
You can then use either brushless or brushed motors.
Most of us on here seem to be of the opinion not to go faster than a 10.5T brushless motor in case of damaging the vintage gearboxes.
Just for reference 540 is the motor can size, which in 1/10th models is still the standard.
Regards
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