318 stroker using Scat crank

As long as you understand you're going to spend more to get this together and running than a 360, that's cool. The combo you have will leave the piston sticking out above deck by .250" or so... You need to get a shorter 318 piston, or a custom piston (which would be my advice). Sure you don't want to just build a 4" stroke or get a 360?
Numbers match is the clincher. Keep the 318 crank with grease on it to prevent rust.
There is more to life than up front cost or brute HP.
A collector car with the numbers matching drivetrain is worth extra money especially if parts like the teplaced crank are kept for the sale that may be down the road.