In 95, unless ordered specifically, your 336 probably came with one filter. A two micron just downstream of the manual fuel pump. If it has a Racor on it now, it has probaby been modified. Good news! You said one filter, so it probably isnt the small screw on size. But the bigger ones similar in size to an old style oil can. I would just take a read of what is on the filter. You will probably want a 30/10 as previously mentioned. Here is the set up on my 95 336. If you have any questions on your new boat.... just ask. We have done alot to ours.
Cheers