If you are keeping the '79 I think you will be fine. I'm sure the above mentioned X-9 has to weigh alot more than your boat. I tow my 87 prostar with the added weight of an ND tower with an 04
I6 trailblazer and it gets us back and forth without any problems. Of course where we live and tow it's not to hilly and our longest tow of the year is about 2 hours one way.