Is it BO and LO or is it B0 and L0….that is the question??

I'm gonna go "LO" as documented in the vin decoder ... "0" indicates the number of year, whereas "O" indicates the product designation as in "Super Stock".

1st digit: Car make:
B = Barracuda
J = Challenger
L = Dart
R = Belvedere / Satellite
V = Valiant / Duster
W = Coronet/1971-74 Charger
X = 1966-70 Charger
2nd digit: Series number:
O = Barracuda Super Stock (1968), Dart Super Stock
3rd and 4th digit: Body style
21 = 2-door sedan
23 = 2-door coupe
29 = 2-door Sports coupe
5th digit: Engine
J = 426 c.i.d./425hp 2x4-bbl V8 Hemi (1968-69)
R = 426 c.i.d./425hp 2x4-bbl V8 Hemi (1970-71)
6th digit: Model year:
8 = 1968
7th digit: Assembly plant:
A = Lynch Road, Detroit, MI
B = Dodge Main, Hamtramck, MI
C = Jefferson Avenue, Detroit, MI
D = Belvidere, IL
E = Los Angeles, CA
F = Newark, DE
G = St. Louis, MO
H = New Stanton, PA
P = Export
R = Windsor, Ont. Canada
8th through 13th digits: Sequential production number starting with 100001