Your rifle is a Model of 1943 Spanish military mauser 98, a model made to 1958, which corresponds in date to the A2- serial prefix. Confirming if original, the chambering 'should be, standard German 8x57. The Spanish were not yet NATO members but were converting to the 30 caliber NATO chambering and some few of those last models may have barrels so chambered.
I fully concur that it is simply uneconomical to considering the 'further sporterization of the already conversion you conjure. Far better to begin with the FN Model commercial action of which, the real bargains driving the market are the Husqvarna commercial FN mauser rifles of the early fifties era. The early actions were only tapped for receiver aperture sights. By 1951 they were being tapped atop receiver for scope.
Nowadays, if a mauser is a decent shooter even of doubtable "aesthetics", an acquisition cost of $250 seems a decent cost from a shop!
Just my take and Happy Holidays All!
John
