Turns over but wont start???
 

I have recently replaced a throttle body fuel injection system on my recently purchased 79 z28 i also replaced the intake gasket and installed a 6oo cfm edlebrock carb with vacuum secondaries also replaced distributor cap and stem but kept the hei supercoil i replaced all of this at once. Before i replaced all this it ran crappy but would start now im not getting any spark but getting 12.75 volts to the coil what did i do wrong any ideas?? I checked the wiring everything seems fine help please

Start with the basics. If you replaced a throttle body with a carb, did you change the fuel system too? A throttle body has a different fuel delivery system, and you need to be sure your car is getting fuel to the new carb. Have you opened the throttle and looked into the carb to see if it's getting a squirt of gas when you work the linakage by hand?
Next make sure it's getting spark. Pull one plug and install it in the spark plug wire, then ground it to the engine and crank it to check spark. Is it getting spark?
If it's getting fuel and spark, you need to be sure the distributor got back in correctly. Check to see the engine is at top dead center, and that the distributor is ponting to #1 cyl. Then if not you need to lift it out and turn it to #1, and possibly turn the oil pump shaft to allow it to drop in correctly.

I am def getting fuel i added a fuel pressure regulator and gauge and checked to see the fuel squirt in everytime i throttle up i also pulled the spark plug out and checked it but did not ground it ill try that and see but i did check tdc and it dropped in smooth without turning oil pump

evidentally when i put the distributor together the spring for the brush insde bent over and didnt make contact hence no spark its up and running now thanks

That's good news! Glad you got her running!

Figures, sometimes the obvious and more simple fixes are easily overlooked.