Denny,

It's definitely a 410. The Ford truck came with a 360 from factory. This engine was pulled out of a 66 merc and rebuilt to run on propane, which is why I'm pretty sure its going to have too high of compression for pump gas if I just throw an intake and carb on it. I've also read that the intake valves are restricted if it was done right--which is how this guy built everything he put his name on.