what you need to invest in is a good Wide band 02 reader such as one from Innovate Motorsports (if you have a laptop computer you can get the cheaper $200 model)
this way you are not guessing and have a less chance of screwing up your engine....do not start swapping parts from one version to another....
here is another L-Jet guide, it's for the 912E, but has some good info worth reading
914E L-Jet guideWith the WB02 sensor, you can see what you motor is doing and possibly adjust the fuel pressure to compensate if you need more fuel (to a point)
Does the car run now? If so, then chances are your cam is not too aggressive......
I cannot find my notes for the 1.8 injector flow rates, but they are less than the 1.7 and way less than the 2.0, but don't let that fool you, the 1.8 injectors are good for over 160-180hp if my memory is vaguely correct and you are well under that limit I'm sure....