A bit late answer on this, but no, not any M98 will do. Supposedly many actions made in the latter part of WW2 were not made well with good metallurgy. Due to difficulties in obtaining proper raw materials. This is just from what i read in a US custom rifles book in the past, but it makes sense.

I know the collector angle of not using "fine" mil rifles is often said, but having purchased a rifle which sat on the net for sale for two years once, and no 'collector' picked it up, it didn't cut it for me in that instance.

Collector rifles also often sit in huge collections mostly gathering dust. I think rifles were designed to be used. But modifying fine examples of rarer ones, well yes, that might be a shame.

Ben, good luck on your new expected rifle.