Most places don't sell complete swaps for ZCs because the D-Series trans works with the ZC. If you do, I'd think it would be more than $700, since just the engine is usually $500. Most websites sell the longblock for this price.
You don't need new injectors, you can just run some injector cleaner and clean yours out, otherwise have them blueprinted, or you can buy new ones, but it doesn't matter. Just make sure you do something to clean them out.
The PM7 is a bad idea, because it has a top speed governer of like 115 MPH or something like that..unless you like that sort of thing.
There is no chip for the PM7 as far as I know, I think they only sell chips for the PM6 (USDM Si) engine.
The D15 exhaust manifold works, it just has to be ported a little because the ports are a few millimeters off from the ZC. If you don't have access to a dremel right now, you can run it without the port job, but do it soon because that's just a restriction that'll slow you down.