[mechanicalman]

Airspeed has a 4WD, and a good chance he has distributor advance problems.

But still, if you can send it back without costs, I'd do what I already recommended to you and get the 260HP and put in the cam/lifters I recommended appropriate for that engine.

You could use the lifters that come with the engine, I don't believe it has been ran so they would not be broke in yet but the lifters I recommended are the best wear-wise by far.

Then, while the oil pan, valve covers/timing cover are off so you can put some chrome ones on there and a nice 1pc oil pan gasket to ward off the inevitable leak the factory gasket will give you.

Or, just stick with the 260HP and be happy. Remember, it only makes 260HP with headers and a spot-on tune. So, put headers on it.

If you installed a new cam, and IF for any reason other than cam if the engine failed, you could save the original cam/lifters and put back in it before you sent back the core. Easy-pesy.