engine model and serial numbers

[outtaget1]

I have purchased a buick marine engine.. Info from the seller is that the model number is TU-15S, and the serial number is W53426........ I do not know where these numbers were taken from, the engine is in shipment to me at this time so I have not laid an eye on it yet..
Ya I know,,, what an idiot I must be.. well,, some people gamble, and I dabble.. some times it is better than christmas tho. hehehehe

Anyway, I would like to get some peculiars on this thing for the purpose of deciding what to do with it when I get it..
Such things as size, parts availability/exchangability and maybe even some opinion from anyone who may have some knowledge on this critter..

JS (outtaget1) but got one already..

[dg-gs350]

Can't say I recognize those #'s, or know anything about marine-use Buicks, but here's a link to manuals for Buick marine engines, listing 225, 300, and 401 engines: http://www.marineengine.com/manuals/buick

Here's some info on rebuilt engines: http://www.rebuilt-auto-engines.com/...html?catid=107