Aren't. You should have your injectors cleaned, blueprinted, and balanced if you can find spares.
yea its really important to blueprint and balance your injectors..... i would just worry about keeping them clean.
anyway, i dont know how well your new ecu works, but if you can change the afr for different rpms and loads then you shouldnt keep it at 15:1 all the time. you should increase for high load and decrease for low load. if you look for posts by suspended hatch he goes into more detail on how to do the same thing with a honda. but the bottom line is that if you are adjusting these settings, you should go to a reputable tuner and have them work out all the kinks. im not saying what you have now is bad, but a bad tune will break a motor.
how about the obvious with a convertable: teardrop hardtop?
don't waste your time or time will waste you