Jack:

That is definitely a reworked USGI stock, probably by Griffin and Howe, and most likely an NRA Sporter stock to boot. Your barrel appears to me to be an NRA Sporter barrel, and not a military barrel. Good find, finding a Sporter receiver will be nearly impossible, but a 1927 receiver should be doable. You need to looks for one drilled for a Lyman 48, or you will have to drill the one you find.

For that rifle restoration, a complete donor rifle may be in order.

Good eye!