An online fiche shows a cylinder head assembly 11100-24B10 is used from 1996-2019.  11100-24B06 is the earlier head number but it doesn't come up on the "where is this used?" search at two different sites, so it is hard to say if it is superseded by the later number or not.  My impression is that the 4 and 5 speed transmissions are the main difference between the new and old engines and even those can be interchanged so I'd expect that the later head fits all the older bikes too.

Crankcases are sold as a matched set which surprises me.  Yamaha (at least) has sold the left and right crankcase halves on their 2T dirt bikes as individual parts for many decades, and I had presumed that with modern manufacturing processes and quality control that would have been the practice with the Savage too.  The cylinder head and rocker cover as also listed as an assembly.

So you may need to keep cases or a head+cover together as a set, but pretty much all the other parts should safely swap around (as long as you swap an assembly).

$150 sounds like a good deal to me!

Thanks Dave!!  That makes such perfect sense now!  Sometimes I wonder if I think too much or not enough!

Michael I know!  $150!  There are a few donor parts I could use, and I’d like to see if I can build a nice head.  Dave sold me a gently used Web-Cam 466 that I’m itching to do something with.  It’s a very mild grind that mimics the stock cam with a little more duration.  I don’t think it has any overlap and doesn’t do much if anything top end.