Got an 87 ford box van I bought new, 48,000 original miles, I use for my work. 460 ci. Might sit 4-6 months or longer at a time, starts right up and runs fine (holly carb) but all this talk has got me worried a little. If it ain't broke I ain't touching it. Always used whatever was at the pump, leaded reg at first, now 10% corn.