Then the end is already in sight for you. Fuel rails are of many forms. Once (and some still are) rigid, as in a hard non-bendable tube or extruded piece for all injectors. More commonly today, they are flexible "soft" (rubber, nylon, PE, etc) hose, or "semi-rigid" formable and solderable tubing. The last two (and hybrids) are desired for their ability to allow different angles and elevations of injectors, and ease of alignment and assembly. Down-sides are that soft rails need support for each injector, where semi and rigid rails only require a couple support points at minimum. Intake and TB flange bolts or other features are common support points.toddTR6 wrote: ↑Sat Mar 07, 2020 2:28 pm… As for port injection, I'm pretty certain I can add the injector bungs to the above manifold and fab up a fuel rail. I have access to a drill press at work, and I can put together a jig to keep the manifold steady while I drill it. I think the difficult part will be how to mount the fuel rail and keep it in position. …
I often make my own bungs from a steel former and aluminum tubing. Cut the tubing in sections and press over the former in the vise. That's it. Drill the intake. Align your bungs with your injectors and devised bracketry/retainers with injector hats or rail(s). Secure the bungs with hi-temp epoxy. Clean-up the excess bung and epoxy from inside the runners. Done.
Some examples of soft or semi-rigid rails and formed bungs are in posts I've made, like this. I'm currently enjoying cupronickel-alloy fuel and brake line. Various diameters, short lengths, rather inexpensive (under $10 for 3/8"x30), and a breeze to silver-solder like factory versions. I've had no need to use extruded rigid rails in a very long time. Soft or semi get it done. Pick your path and do your thing!