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I want to know the thickness of the fuel pump mount gasket #327807. I have an 0.028" and a 0.103" It seems that because of the relatively short stroke of the fuel pump lever and the angular engagement with the camshaft fuel pump cam, the gasket thickness may be important. As much effort was made to thermally isolate the fuel pump from the crankcase, the fuel pump is thermally isolated, so the thicker one might make more sense. (There is no metallic thermal path; the mounting bolts are thermally isolated. As use of metal lockwashers would normally be used, instead a nonmetal isolation flat washer (and bolt sleeves) are used. But the bolts may not stay tight, so the heads of the bolts have holes in them to wire them in place to prevent unloosening)

One I have out of an aftermarket rebuild kit is .025 and another from an NOS Packard engine overhaul set is .086. While there would be some change, I don't know if the variation would cause enough offset in the geometry to be of concern. Since you are going to the trouble to isolate, I think I would go with the thick one too.