So I found B078 on the handlebar stem. Then the brake has BENDIX 76 MEXICO - not sure that I can count on that to be original and the 76 to be for 1976 but that is what I am assuming now. And the B078 to mean 1978.
I learned a lot about this bike through this thread. Thanks for the help...
@RustyGold - so great. I will take it.
I found the another thread on RatRods for someone else with the same bike frame and M0 serial number. Bought a western flyer and need help | Rat Rod Bikes
Thanks everyone. That was fun.