I have a Classic Vibe Jazz Bass 60s body, and a Vintage Modified Fretless Jazz Neck (yeah it's got a synthetic fretboard but whatever). I tried adding the neck today but it was an extremely tight fit. I checked the string position and I can tell it's also going to install slightly angled so that the G string is nearly going off the fretboard with maybe 1/16th of an inch of space between the string and edge of fretboard. The E string would be angled towards the center of the fretboard. Below is an image showing approximately how the E string looks. What I am thinking is I need to angle the neck left. Anyway, clearly I have to sand something here to get this neck to fit and also angled the right way. Which item should I sand? The neck pocket or the neck? I am thinking I could sand the left side in the image above on the body, or the left side of the neck. Also, what sort of sand paper should I buy? One other bad fit is the round base of the neck where it meets the pickguard. The pickguard and body are cut to a greater radius if that makes sense. The neck and neck heel don't match exactly in "roundness". The scale length was nearly dead on though, it will be able to be fixed by adjusting the bridge screws. I am not sure what Fender specs are aside from width of neck/neck-pocket, though I've read that people say to check which is out of spec and fix it. I just am not sure if that's the best thing to do. Thank you!