Greetings Dogbomb,
Got plenty of those in my backyard, and could use a whole bunch down at the Coronados... but I digress...
Congrats on the the Seafari. I too, had a SeaCraft hauled sight unseen from the other side of the Big Muddy. Pretty sure its some kind of unrecognized disorder

.
At any rate, I'm sure Capt Terry and Bushwacker have already mentioned what a versatile little boat it is (see pic below).
A couple of things to note:
Scuppers tend to leak. They probably need replacing and are about & 5 ea., online. Moeller also has a flaring tool for about $35. These scuppers are very efficient underway, but not at the ramp or sitting still.
The scuppers corrode/crack over the years and water seeps in around them saturating the wood blockthat surounds/supports them, and then nature takes over. Usually visible along starboard string by batter pad if you're looking for it.
The other leak tendency is at the seam between the hull and cap. This will saturate the cabin and eventually you'll have a wet sleeping bag on a cold night @ Lake Powell or Havasu.
Addressing those two things are easy and offer some peace of mind.
Great boat for your plans. BTW did you ever look at the Yellow Seafari 20 listed in Fullerton?
The little placard does tell you about the boat. It will state make model and location of mfg., and maybe a couple other things. Hull ID should be in upper starboard corner of outer side of transom.
First 3 letters are Mfg., "SEC," or other depending on the year and manufacturer, 4th is model, 5th is length (a 0 for 20', a 3 for 23', etc.). 4 & 5 may be vice-versa? the rest are no., mo. the last 2 are the year of manufacture. Post a pic and we'll help you sort it out.
Cheers,
McG