Just FYI, RB...In 1959 GM started working to lower smog and increase efficiency. From actual GM correspondence, "Also new is a special economy package consisting of a small throat carburetor and lower ratio rear axle, which further improves the economy of the Thriftmaster on Series 31 and 32 models. All engines continued from the previous year feature improved efficiency, greater durability and more favorable performance characteristics. Major refinements include a lower lift camshaft and modified lubrication system on the Thriftmaster engines. Gray paint is again used on the 235, light duty 283 and 348 and green paint on the 261 and heavy duty 283 units."
The bottom line is the 235 enjoyed a nice torque line which saw near maximum torque around 1600 rpm stretching all the way over to 2800 rpm. So, one way to get more usable torque in a long flat range (without spending an arm and leg) is to use a 1959 camshaft...or one that mimics it. Good luck!
