Recommendations for Savage long action stock or chassis

I’ve used AI, KRG, Foundation, McMillan, HS, and XLR.

I haven’t tried KRG, MDT or MPA.
McMillan would work. but you'll be waiting

MDT ACC as well and it's CIP length

if you're gathering pieces i'd do a zermatt origin instead but that's just me. give you a lot more options for basically everything