I do not see any illustrations in that Shop Manual that show the 4 small bolts (not 2 bolts) that hold the retainer/collar/ring (and u-joint cover/bell/ball/housing) to the transmission. The lower 2 bolts also attach the transmission rear mount to the frame cross member (on 1953 and earlier).

Do you have the retainer and the u-joint cover/bell/ball/housing and the seal-collar (at/around the torque-tube)?

Do you have the transmission mount?

If possible, please post links to photos of what you have.