93 with a Chevy? hmm thought they were Ford 351's - used in salt water always get's me thinking.. lot's of rust on the riser union.
What's your budget for repairs? A new set of risers and exhaust manifolds will be about $1K. I'd immediately install a new raw water pump - $185 - Kyle has a cool cupholder..
How many hours total? Wheres the top of the ski pylon?
If you're going to drive it back - would check drums and throw in a new set of bearings.
How old are the tires on trailer?
How do the springs look?
Do trailer breaks work? Trailer break refurb - $500-$1K