Hi Jimmie . . .
The build sounds like fun. Should be a good upgrade in the '46.
Given the vintage of the build a glass pack muffler seems in order.
Smithies are an option but they rust (at least here in the midwest). A stainless steel glass pack seems a better investment.
An .060 over 235 is 40.58 CuIn per cylinder or a 243.5. With an 848 head you should be in the neighborhood of 8.5:1 compression ratio.
Not sure what rear end you are referencing. In the late thirties Chevy was shipping a 4.22 or an optional 3.73(rare).
In the forties they shipped a 4.11 and an optional 3.73(again rare).
In '50 when the power-glide transmission arrived a torque tube 3.55 gear made the scene.
Is your car perhaps converted to an open driveline?
regards,
stock49
