A couple of other things to look for are:



A loose fit between the pylons and corner castings. Most boats have a little slop here but if it seems excessive you may have to do some work to reduce the slop. A loose sloppy boat is a slow boat especially in heavier seas.



Look carefully at the trailer for the condition of the tires, bearings and wiring. Any of these items that aren't servicable can cost a lot to fix.



Also, if you're going to race, look for a post '84 model as it will be about 35 pounds lighter.



Cheers