I would side with Tower on this. If it was running before ok then your IP should be fine. I would do it in that order: Start by bleeding on the inlet of the IP. Then on each injector. Shouldn't matter which ones you do first to last. I would think you would get a better bleed if you have help cranking. Kind of like bleeding brakes. If you have too much air in the line your injector can't fire! With help, you can crack a line and get all the air out and tighten it back down. You might be able to do a couple or more each crank 'session'. Crank about 30 seconds and then let the starter cool for about 2 min. I would bet it will start before you get all 4 bled!! I put an older 12V back together and it tried to start with just 2 cyl firing!! It did with 3!! If your engine starts but won't smooth out like normal, go ahead and bleed the last or remaining lines. Getting all the air out should have it purring like normal!!
Let us know how it turns out!!