Based on the windshield, I'd guess it's late 60's early 70's, and although all 4 guys fit, it seems a tad small, plus it has a relatively small OB cowl/hood. So I'm guessing it's a Jet, Jet Star, Nova or Falcon. 14-15ft. Not likely to be a Jupiter, Nassau or Viking, which are the 16ft versions of the same looking boat.
The vent was probably a dealer or owner added option. I've not seen it on very many SC's, but it was a popular style/type of bubble windshield used by 1000's of boat makers, both fiberglass and aluminum. Possibly made by Taylor Made,
A profile shot and having dimensions would certainly help: Length (a 15ft Jet is often not exactly 15ft), maximum beam (width across the boat, usually thru the helm), transom height and transom beam.
If that bow color is original, just faded, it too may help ID the year and make. Look thru the brochure pages:
Starcraft brochures