Compared to stock drum brakes, it'll be an improvement, but there's a possibility the master cylinder won't match up to the piston area of the Wilwood calipers.
That said, the stock disc brake calipers have a larger piston area than the Wilwoods and actually offer a higher clamping force than the Wilwoods.
I would actually recommend a kit like this one. -->
https://www.earlyclassic.com/node/1213