Before you totally scrap your pre-66 project here is what I did ...I paid 25$ for the original 7MM mag from a pawn shop...It came in a cardboard box...All the magazine parts were loose, bent and broken, My plan was to use a single shot follower anyway (of which I fabricated one from aluminum plate at home)....I bought a new bolt body from SSS for around $25 dollars a new bolt head from midway for about the same and a small firing pin from Midway (around $5).....The firing pin did require me to do a little threading on the firing pin body to attain correct protrusion and timing but with the magnum bolt head you will be using (which I believe is a little longer) that me not even be a problem.
I first installed a Timney trigger with all the small parts from another newer action.....It worked great....But while working on another build I "borrowed" the
Timney and re-installed the original factory trigger on the pre-66....These triggers are very adjustable and I got it down around 3 lbs without a stone..I am sure you could get less with a little work...To me it is not as good as my Timneys but very close, much better than the later 3 screw savage triggers...
BTW it has a 26" Douglas varmint tube in 25-06 and usually shoots .5s but my best group to date is a .6 at 300 yards.....My total price in the action was less than $100...That left me more to spend on the tube and stock which is a B&C Duramax..
Good luck,
Randy