If your 88 is beat and the 89 is clean then that would be an idea. The 240s have a cult following, look at all of us working and thinking Volvo 240. In my area clean 740s sell for less than clean 240s. I saw a clean low mileage 92 740 asking $1200 couple months ago, the same 240 would have been 2-3 times that. For good reliable transportation the 740 will be fine, but I would keep the 88 unless its beat.