I plan to trade my GMC 4x4 3/4 ton (value $1500-$1700)for a 1977 Seaswril 120 OMC with GM 4 cyl in good condition.<br />We plan to take on lake in a couple hours for a test.<br />What should I look for when on test.<br />Should I stay away. Seller has had boat for 8 mths. wanted to trade for seadoo.<br />Thanks<br />Rich