The shureflow pump has been the center of the DIY kit for years with virtually zero failures. It has proven itself within the Buick community as a workhorse. Now it is a plastic diaphram style pump that works with zero issues as long as no petroleum is added. The only shureflows crashing have been from guys using lube or bypassing the pump to get 250+psi output.
It has proven to work on water, methanol, denatured, isopropyl, and mixes there off. I have heard of some using Acetone as well..but I havent experimented since straight methanol has worked so well.
The nozzle supplied with the kit has been the M15. It with 150 PSI on it should supply enough to feed a car well into the 10's. It looks like a sprayer at the car wash
Put it like this, an M15 with 75 PSI will supply enough to get a car into the high 11's easily. Typically.
I have been using a bonded steel washer with an elbow. Its actually so simple, some drill and JB Weld the nozzle in place. The steel isnt hit with alcohol so its corrossion isnt a problem. Alky corrodes items that are in constant contact.
With a progressive kit you dribble it in at low boost that way the pump primes and the delay is completely eliminated. Plus keeps AFR's in line pretty much.
So multistage, multijet, multi-leaks are eliminated.
HTH plan your system.