What to watch out for

Is there anyway to tell if they are "X" heads without taking off the valve covers?

Yes, you can see an "X" cast into the head by the spark plug. He would have to be stupid to try and get passed someone on this.

Is this a good price or should I try and get it lower? Thanks

Allways try for a lower price. But he may not budge.

How will you know if it is any good. Ask for the billings and general guarentee on it. If it is built right, it should last a long time. If you drive it like a normal person, it will last.

Beat on it and even a race engine will die a quick death before it's time.