Ford 300 / 6 is a very dependable engine. It may be under powered at highway speed but will have plenty of torque low end. They had a couple of known issues, one being the timing gear - the fiber gear would go suddenly, leaving you stuck on the road, and should be replaced with a steel timing gear to be certain that doesn't happen. The other thing that was an issue is if over-revved they would break piston skirts. You will know this immediately on driving, its a terrible knock when just starting under load. Having said that, I put 50K miles on one with broken skirts it it never did quit. They are more than likely to run longer and cost less to repair than any modern V8.<br><br>The other problem you may find is that the van may be geared very low due to the smaller engine, and those engines will burn a ton of fuel if revved over 3000RPM. They were designed to run at lower speeds (long stroke, long rod, high torque).<br><br>The add is funny - listed at 3350 on craigslist but pic in the window says 2999 They need to work on their advertising.