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YankeeWhaler,
The Site Search on the left sidebar is your friend.
I typed in Chuck Bennett and came up with this.
http://www.whalercentral.com/search.p...p;chars=50
cbennett@whaler.com

Ross,
You would have either a "Custom" or a "Sport".
Can't be two models at the same time.
So, yes, you have a Custom model.

Looks like it is most likely an eye (i)
Most L are upper case with the leg at the bottom.

BWC3912?M78i

Don't know if the question mark above is an "A" or a "B"
However, it most likely would be a "A".
BWC3912AM78i
5A????

Built in April of 1978 as a 1978 year model

See this list:
http://www.whalercentral.com/articles...cle_id=109