I nought a 413 motorhome engine from a motorhome a while back. It is supposed to have around 33,000 miles on itand I needed a runnung bigblock so I could move the car around under its own power. When I picked it up I was supprised at what I got. It has unique cylinder heads, exaust manifolds, distributor, oil pump drive, camshaft, and a gear drive for the cam. the dampner is also different. It also has low compression pistions, on the positive side it has a steel crank with a 6 bolt flange. as soon as I am done with the car I intend on using this for a 426, but until then I have a large stack of iron left over from the motorhome specific parts. If you have the room to store it why not? they sure are not making them anymore.