Put it all back together and spray it right down into the inj holder. If you have spark it should do something. I've never had a timing chain go bad on a K21 OR K25 but anything is possible. I think you can remove the oil fill cap and look inside to see if you have any rocker arm action when you crank it over. You mentioned earlier that you thought it wasn't getting any air into the cylinders. If the chain is off your valves don't open and no fuel or air gets inside.
Motors with timing belts are bad for that problem. This engine has a chain. Somewhere it has an issue that just needs to be located. Everyplace there is a brass colored cap on the inj holder there is a spring and check ball that you can't remove , sometimes you can clean it enough to make it work and other times you can't. Did you spray inside all the port holes of the holder? Thats where the tar clogs everything up. Good Luck