I'm not a chevy man, but I'll take a run at some of the bearings. NAPA prolink will convert most of the old GM numbers to modern bearing numbers. For instance:
4.355 Bearing, clutch gear pn 903209 = 6209J
4.408 Bearing transmission rear pn 901307 = 307J
4.422 Bearing countershaft front pn 142260 = M1206UV
4.422 Bearing countershaft rear pn 121856 = M1207TV
The last part numbers I gave are the common modern number, and if you check on ebay you should find them at reasonable prices.
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