Hi Kenfu, treble side of things seems to usually have the saddles furthermost forwards with low E a bit further back. Thankfully these F style bridges have plenty of travel.

I would measure 34" from inside nut to top of G string saddle. Clamping neck is probably better way to go as you really need to run E & G strings so that you can see how neck is aligned within the pocket before you start thinking about screwing it in place. How the strings pass over the PUP's and spacing at this point is also highly important not just for appearances but also sound quality too.

I think this website/forum has a thread or tutorial on it somewhere. For my EX-5 I cheated a bit as there are a couple of P Bass styles kicking around and took multiple measurements off them as a starting reference point to eliminate much of the guesswork.