You replaced injectors and now you think raw fuel is coming out the tailpipe? Why did you replace injectors? Did it smoke before you replaced injectors? Sounds like you may have pinched 1 or more O-Rings when installing new injectors? Too much fuel in cylinders can wash out the walls and cause compression numbers to be off. What colour is the smoke coming out of tailpipe?
Easiest way to check for HG is 1.) are you losing coolant? And 2.) pressure test the cooling system and see if it holds pressure. If it does, you do NOT have coolant leaking into cylinder. If the pressure drops quickly, pull all the plugs and get a flashlight/Boroscope in there to visually look for coolant pooling in cylinders.