So the rusted over capacity plate IS legible and reads 1050lb max? 1300lbs is higher then 1050lbs where I learned math....................
And unless it isn't actually a 1965 Dart, which is possible (we'll come back to this, but it's the info you provided) the Starcraft data shows that model as having a weight limit of 850 and having 2 back to back seats w/ 4 people max. So again, whether you go over the shown weight capacity regardless of the number of people, OR over the number of people capacity regardless of their weights, you are OVER the rated limits of your boat. Depending on where and how you boat, being over the limit may cause unwanted attention and possible fines. The same goes for mounting an outboard that is over the rated limit as well. In the case of a 1965 SC Sea Dart that's a 45hp max.
BTW: For the purposes of weight limits, the USCG uses an estimated per person weight of 150lbs to allow for the weight of gear, outboard and EVERYTHING else that's in the boat: Flip flops, gas, coolers, towels, everything................
If your data plate shows 1050lbs AND shows that it's a Starcraft Dart (probably a Sea Dart, as there's no 1965 SC Dart shown) then it is possible that any paper work you got w/ the boat, title, registration, etc, is incorrect. It does happen, and happens fairly frequently with many different makers, not just Starcraft.
This is an aluminum boat, correct? Does it look like this 1965 Sea Dart (bottom center yellow boat)
If it is 'just' a Dart, it's possibly a 1964:
A 1963:
Or a 1962:
You might dig around and see if you can find any indication of the original color of the bow on your boat. Sometimes that's the only way to judge an SC's year, typically, they only used 1 color each year for a specific model and changed it w/ each new model year.
Also notice how the side splash rail on the 1962 & 63 runs much straighter up to the box, and doesn't have nearly the curving up sweep that the 1964 & 65 splash rail does. How does the splash rail on yours run?
All of these new Dart's show seating for 4, so I suspect they are all about the same weight, people & OB max capacities as the 1965 data sheet that I provided shows.
You asked for an opinion, and to support my opinion, I provided facts, backed by proof from Starcraft. If you took offense, or just didn't like the answers, well, that's unfortunate.
Boat & boat rehab safely