Pontiac, Chevrolet, or Plymouth, Dodge or Tomato ,Tahmotto.
I get that, as was the 261, a GMC and Canadian Pontiac engine.
Last time I checked Pontiac was owned and Produced by General Motors aka Chevrolet Pontiac Buick Oldsmobile Cadillac GMC....
John this engine at 90 hp and 128 ftlbs of torque in a much higher RPM.band than even a 201 or 218 Chrysler flathead is not a great candidate for these cars.
They have been used and souped up in light hotrods over on the HAMB.
But we are talking small and light.
The USPS delivery vans are what, running around city and town streets, stop and go.
At least it is a better engine than a 2.3 litre Vega or Astre engine. I know as i owned 2 of these many moons ago...