[oil pan 4]

Looks expensive. I was thinking something more along the lines of finding new generation 4 or 5 hole injectors for your application at a junk yard and paying $40 or $50 for all of them.

Problem with 18 pound per hour is that the vehicle is going to tend to try and run rich. The closer you can get to 14lb/hr the better.
Also fuel injectors don't meter fuel on the low end real accurately. In theory you should be able to use a grossly oversized 25lb/hr injector on a weedeater motor but it don't work that way. You will find over sized injectors perform poorly at metering fuel on the low end of use at idle and cruising. They tend to dump too much fuel on the low end due to magnetic hysteresis, that limits the minimum time the injector stays open. If that minimum close-open-close cycle will let more fuel through than your minimum fuel requirement then you are going to run rich some where and there is nothing you can do about it, aside from put the correct injectors in. You can turn down fuel pressure then that limits atomization.