Nailhead gurus, a manifold question

A buddy of mine just picked up a '65 LeSabre with a 300 nailhead. The exhaust manifolds are cracked. I can find exhaust manifolds for every size but that, do they interchange with any other motors?

 

The 300 isn't a nailhead by right but, they did come in Range rovers all the way up til I think 1995.

 

understood! so are you saying that a range rover manifold will fit?

 

I think the 340 manifolds will work also. So you are looking for 64-67 300 and 340. The range rover's may work, but may be shaped differently.

I did a search on car-part.com, had to use the non-interchange search, but this guy shows some:
Bud's Salvage USA-OK(Aline) E-mail 1-800-375-2837 1-580-463-2424

There are more listed. Like I said, use the non-interchange search buick lesabre 64-67.