Yeah, that's a sweet lookin vintage Mustang. And welcome to the Forum.
I agree with Silenus; keep the beautiful original paint. And get a tort pickguard.
About those pickups. Not original Mustang pups, so preserving vintage value is not an issue. But it's an option if you want to hunt for vintage Mustang pups. Or you can buy replica pups.
But here's the thing. Among most good single coils, the difference in tone is just not that much. Between P90s and traditional single coils, yes. But when you consider what a decent amp can do with tone; then what pedals can do; and then consider your strings, your cable, your attack, all these influence the tone you get...the various good quality single coils you can choose from just don't make that much difference.
But it is fun to experiment. And there's always placebo effect. 😀 So enjoy, whatever you choose to do.
Doug
