On the Distributor in back part, if I remember right, there was a fear of water drowning problems. Also since the chassis required the rear sump, it was easier to have the distributor at the back of the engine to drive the oil pump. They never imagined the kind of pressures the modern race stuff puts on the cam as far as twist when the oil pump is also driven at the other end of the cam. Todays spring pressures were unheard of then, as the most radical cams and valvetrain was not much more than a now typical flat tappet cam set up. Do you realize the Pontiac V8 design has been in use 50 years this fall? That is an achievement !!! And just think, chevy borrowed many ideas from it to get their small block in production. So hats off to the Pontiac engineers of 50 years ago.
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