Fox Possible timing not sure

Did it start doing this after you did the work?? Then You need to double and triple check all you did...
Have you timed it?? Check to make sure you have all vacuum lines on or plugged...
recheck your spark plug wires... Betting you have one crossed. If your using a diagram to tell you your firing order, it might be he wrong one....
Do you know if your firing order is standard or for an HO engine??
Is the distributor cap on correctly?? Is the new Rotor installed correctly??
Have you ever installed an intake manifold before?? Possible leak there

Let’s start with some basics. Is this a Mustang? What year? What transmission? How many miles? Carbureted (factory, aftermarket, converted) or injected (factory, aftermarket, or converted)? How many miles? And pictures always help (of the car and in this case the top of the motor).

About the only thing I know for sure it is had a manual transmission with you mentioning a clutch and that you installed an Edelbrock carb of unknown size and an Edelbrock intake but we don’t know which one.

I can assume from your statement of “I have an 1985 carb !” we might be dealing with a 1985 car with a carburetor but that’s about all.

Don’t take this as me busting your balls. You need to provide details so we have any kind of shot at helping you diagnose a problem over the internet.

So with all of that said welcome to the forum and what are we dealing with?