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Think the 59 is different from 58 in the shift indicators, but most of the linkage should be the same.

Have you checked into using 60-72 Chevy Truck 2 link trailing arm suspension? Check hot rods to hell website for the parts.

I currently use type FA in my Flight Pitch and seems to work just fine.

Yes you can push start a variable pitch dynaflow, and a flight pitch dynaflow (1958 only). Here is how it is done:

Variable pitch (all years): push car to 20mph, then turn on ignition and place selector in LO. Continue pushing till engine fires.

Flight pitch: Same as variable pitch, except place ...