-That is the question. It's last decision time for the voiturette chassis. I have 2 motor mounts - one for an FF can and the other to fit a standard C can - either allowed by the rules so long as they are under 18K
In the spirit of the game, the FF can seems the more appropriate choice being about half the size of anything that would fit a GP car of the era but.....an 18K FF can has half or less the torque (and braking) of even a modest C can of similar specs. Having entered several proxy races for half-tonners and later 60's F1 cars where the use of an FF motor was either dictated by rules or determined by body dimensions, my observation is that light weight is a must for good results.
Now, the combination of light weight, narrow tires and track and a relatively high stance is not, on the face of it, a formula for stability.
A C can motor would provide more leeway for chassis weighting - perhaps a nice thick brass rattle pan thus offering improved traction and stability but....(and this is an issue in part devolving from my choice of prototype) the very low cockpit sides of the W165 would have the motor sticking up like a great lump - hardly an appealing sight.
My "modeler" side and my "competitor" side are having a heated discussion!