What a beauty!!! Like you, I too have a 76 P - mine is a Matsumuko made Aria Pro II. It looks just the same. Ash and Maple. I've gutted and upgraded all of the electronics and hardware.
The bit that astonished me is that I bought a new Fender USA pick guard and plopped it on my 42 year old 'copy' ... and the screw holes line up exactly! Hell, there are Fenders where that doesn't even happen ha ha ha!
I love the bass, but I do plan to treat it to a fret job and a new nut. Oh and it sounds oh so good. Yours will too, that I promise when it's all hooked up, congratulations!!!