The SPB-2 should drop right in. Just solder em up!
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[I fitted a Wilde (Bill Lawrence) P-46 to it and have never looked back.
Thanks for the nudges! Today has been a good day, but my jury is still out.
My home practice rig is a 1967 B-15, but I don't crank it that much as we live in a townhome.
I started my night by putting the stock pickups and preamp back in my '96 Cowpoke. I had an idea a while back to make it passive, so I removed the preamp, left the stock jazz pickup in, and swapped the p-pick for the SPB-2, but it never sounded right. The P was just super weak and it didn't sound good. Putting the stock electronics back in this bass reminded me of how good it really is.
So I was then left with the SPB-2 just sitting there, so with your prompting I threw it into the 2010 American P. Granted, I'm not playing at show volumes or through my show rig (PF-350 through a 2x15), but I noticed a difference. Not a huge one, but it just felt like "more." A bit more volume and overall tone, and a bit more "grindy" when I dig in. So far so good!
I'm down to three basses at the moment, and this P is now my only passive (the other has older active EMGs). I didn't want to lose the classic P tone, but I wanted something with just enough balls behind it. This might be it.
The P-46 is still on my short list - might grab one just to try it.