Let's take a look.
Your hull was rated at 280 hp in the early 80s. To get that, you would mount twin 140hp motors. A 140 weighed
just north of 300lbs (as shown in the OMC catalog). If the motor you're thinking about is at 600lbs. it would appear to be ok. Thing is with twins, the weight is spread out a little more than with a single but the most important thing is your transom condition.
Has the 1982 transom been rebuilt or are we looking at a factory original?
Good luck.
