High number/low number.
High number range is above 800,000 for Springfield, 285,507 for Rock Island. If the serial is below those numbers, some will be uneasy about shooting the rifle. A RA barrel would be a WW2 replacement. If it is under Springfield 800,000, it would have had a new nickel steel bolt fitted when it was rebarreled. No rebarreled. rebolted low number rifle failed on proof testing.
A scant stock would be WW2 production, I assume this stock was one you sourced when you restored the rifle.
It sounds as if you have a rifle that was made in 1918, was rebuilt during the WW2, then subsequently sported. You mention it has been drilled and tapped. Was the bolt altered?
You have a rifle that went through at least one rebuild while in service, was sported, then was subsequently restored to service configuration. Its collector value is low. If the bore is OK, and the rifle is properly set up, it could be a good shooter.
As such, $500?