I used to spew nonsense that all 64 bolts were the same, having run a New Savage bolt in an old Cooey (and vice versa). Turns out I was wrong, and there are variations in bolt/charging handles for sure. That also makes me think the firing pins might vary accordingly.
Not certain that'll help much... The extractor cut in the barrel will accommodate both styles of extractor. My own experience doesn't make for a clear fav...the 'ol style bent spring steel extractor runs as well as the newer style. I do prefer the older style's screw retained method, as on newer roll pin retained extractors I've seen the roll pins drop a bit and eat magazines! The ejector cut in the bolt will work with either wire or flat plate style ejectors (I converted one of m'ol Cooeys to flat plate style because I was too impatient to wait a couple weeks for replacement wire style).
Clear as mud?
Other than the general caveats of bolt swapping, there are some variations in the bolt. I don't think the cut in the receiver for charging handle is different, but don't have any newer Savages here to compare with.
Some good 'ol timey 64 advice:
-Keep it clean. Get used to thoroughly cleaning every 500-1000 rds. Once clean, run it dry! Lube only for rust prevention/storage. Every once in a while I'll try some different lube (my soul aches with metal on metal, and it feels plain wrong) then regret it.
-Round nosed ammo. Reports vary on successes. Mine all hate Winchester bulk, but others report theirs love it. Try a few
