Motors are easy to come up with, especially now that Penske has switched. Looked at these when I was going to do a Cuda. I was going to give $8500 for one that was complete but needed a rebuild. To make them run well on the street you need to knock the compression out, change cams and add more stroke. They have reduced one to $5300 that needs a rebuild below
Here are 3
http://www.racingjunk.com/NASCAR-ARC...7-Engines.html
Most are around 3.230-3.30 on stroke and the redline is more like 9800 unless it is a restrictor motor.