I have one of those in my Ray34 - search up the thread and you will find it.
As it is the pickup will not fit the Ray4/Ray34 cavity. You need to either rout the body or remove the phantom coil. They come off easily enough, although you also have to clip one wire right back. IIRC it is the purple one, but check first. Then it will drop right in. They are great pickups if you prefer ceramic over alnico.
@SteveCS Your post:
Interesting. I've found that rolling the volume back just a few degrees on my Ray34 seems to tame the transients, but that is the opposite to what you describe. It might mean nothing, but my Ray34 actually has an EBMM Sterling pickup, which is ceramic and can be really aggressive when digging in. Rolling back just a smidgen brings out a more 'passive' character which is great for slap style.
Sounds perfect! I have a replica of the famous MM Stingray preamp from 1979, based on the LM4250 chip, designed by Leo Fender (From Ebay seller: bolebas (44) 100%) that's going in my Ray 4 & was going to put a Delano MC 4 HE/S in. But i think I'll save the Delano for another Ray 4 mod.