I have a 1967 coupe barracuda with a low serial number and shipped march 1966.

235 is 23 = whitewall, 5 = 4 tires and a spare.
H5B = high, split bench, blue.
M2= Hamtramck Plant, it's in the 22 on the buildcard, within the VIN as mentioned above.
w6= new car service with 5 gallons, for 68 it's export to Canada
Definitely 424, April 24, 1967

Sideways number is data operators stamp, may not have that term correct, but nothing special.