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A Boston Whaler Stencil number would not show us the year in the number.

Only an HIN (Hull Identification Number) tag on the boat will show us the year. All HIN numbers are exactly 12 characters in length.

The numbers you gave us are ALL wrong.....
Stencil = AC8292
HIN = BWAC82920473

These seem to be forgeries...... both numbers have 8292 in them and are completely different from other genuine Boston Whaler numbers for the Outrage 21 models...

All Boston Whaler HIN numbers start with BWC for Boston Whaler Corporation...
I suggest you look at the list below again and maybe take some photos of your numbers so we can see them.
A photo of the boat would be good too so we know if this is actually have a Whaler or not.

Your numbers do not fit anywhere in this list.
http://www.whalercentral.com/articles...icle_id=97

Let us know.... and post some photos

EDIT:
Upon further examination of your numbers, you don't seem to have the correct stencil number.
Here is a photo of a 1973 Outrage 21 Banana hull.
http://www.whalercentral.com/images/p...by_rdd.jpg

The stencil number is up front on one of the bow steps or in the bow locker.
If your hull doesn't look like this, then you might not have a Whaler.
http://www.whalercentral.com/infusion...r_id=15855