debest1960 added a post in a topic Tech Question Avid B Help Please
for "B" model S/N 232 weight and balance leveling instructions are as follows (from the manual 1986):
"Block under the main gear until the belly of the fuselage is level from the firewall back to the shock struts. On the tail wheel model, block under the tail wheel.
Level the airplane, fore and aft (see section 4-1)"
That's straight from the manual. however, the section 4-1 is for firewall installation and has no information about leveling. The manual was pretty crude back then.