1990 Chevrolet G30 Box Van Truck

I bought this van over the summer with a pocket full of money and big ideas for the van. Money is gone and ideas have changed, o im not going to need it any longer. The van has just under 55K original miles, he previous owner built nearly an entire subdivision, nd this van was his "mobile tool shed" and therefore didnt see much actual use. I personally have only driven it about 200 miles, ut everything works perfectly. The only noticable issue is that the "service engine soon" light comes on after about 10 minutes of driving, hen goes off and stays off. It has a TBI 350 and a th400 automatic transmission. I put brand new Firestone trans force tires on it, nd replaced a leaking power steering pump. box is 10' to the divider, hich slides open for access to the cab. It has had a cheap, ut professional (maaco)type paint job done about a year ago.