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Thank you for sharing all your trials and tribulations on this engine, this is a fun thread to follow.
Maybe put a tight fitting wood dowel in the front valley tube so you can get a good grip on it without worry of crushing it? Heat and penetrating oil also may help, seems to be generally applicable to taking apart old engines.
You want to find an 8BA fuel pump stand, they are different shape where the fuel pump mounts since the mounting flange got taller.
Pick good looking exhaust manifolds that match the outlet locations currently on your wagon. I no longer worry about exhaust manifold flow since reading the results in JWL's book where he found on a stock 8BA no power difference between three different conditions: all of the driver's side exhaust coming through the intake crossover passage, proper working factory manifold-to-manifold crossover pipe, and dual exhausts.
The truck fans for 42-52 are all the same. 4 blade fans seem to do the job for me, but there is something decidedly "truck" about having a 6 blade unit that can be appealing. The 6 blade fans really cool at idle and low speed, but block enough air at higher speeds that highway running temperature increases a few degrees. Compared to a 59A the 8BA the generator moved forward, but the fan belt stayed in the same place. If the fan blades are bolt on they can be swapped between assemblies. Pick your favorite fan and favorite bearing/mounting assembly and combine them. Remember to take the little screw out of the hub and oil the bearings before deciding on which fan to run.