Vintage basses can be quirky. While some have brilliant elements they also have their own characteristics, whether to their age, their life up to this point or the material/build quality of that particular era.
So I would say; think closely about what you do like about this bass and what you don’t like. Decide whether those things could be better met by another bass before modding this one to try to achieve that.
As others have said, a 78 P does a very good job of being a 78 P. If that’s not the sound/look etc you’re after, then there are other alternatives.
FWIW I’ve owned a 1970 sunburst P for the last 30 years. I don’t love everything about how it plays or looks but it does what it does.
Personally I wouldn’t dream of swapping stuff on it unless it desperately needed fixing.
I have other basses that cover other sonic and aesthetic ground and I leave the old P as it is.
But that’s just my two cents worth.