Again that was camshaft design for the times
Wrong, Barrie. The 305 had a cast cam, the 350 was forged. The front lobe gets the least lubrication, hence it wore the fastest. The same engine was also plagued with fibre timing gears and two bolt main bearings.
The 350 was a much better engine.
There was 3 grades of the cam for fuel milage [sic] as well back then which were factory chosen as well by the buyer for power or milage. [sic]
The buyer of a B body could not specify the cam he wanted. The Canadian cars had more lax regulations and thus made significantly more power.
And yes, by today's standards, neither car was terribly powerful and yes, the both sucked gas.