B = Plymouth Barracuda
H = High
23 = 2 Door Hardtop
G= 318 150HP(net) or 170HP(net) 1-2BBL 8 CYL
4 = 1974
B = Dodge Main, Hamtramck, MI, USA
282064 = 182063th Vehicle
Looks like a '74 with a 318 to me...
If you've got the fender tag you can get info on the options...