[RICK LAKE]

tim sullivan Tim if the car was running right at one time without and drivibilities go back to there. It sound like a fuel problem. Start with the basics, what fuel pressure are you running? is your fuel pressure regulator working right? You have 4.5-6.5 pound of pressure. If yes
Does your car any rubber fuel lines on it?? The new gas is slowly eating the rubber up and turns the inside of the lines into black balls or slime. It will clog the ports and jets in the carbs over time. Yes it some how gets through the fuel filters.
If you can check the fuel filter, pull apart and clean it or replace.
Pull the carb off the car and pull it apart and make sure that the jets are clean, the ports in the block are clean. the cross over tube is clean( becareful with the "o rings on each end" lite grease before installing. Check and set the floats on both bowls if you have them. Basic setup and cleaning done, reinstall the carb. If you have glass levels check them. The motor should run. Start with this then go to the Msd setup.
Do one thing first and pull the cap, check the center post in the cap for the carbon piece to be there, make sure the rotor has no burn holes in the end and the spring end has a little pressure against the carbon center POST. If the post is gone or doesn't look right, get a new cap and rotor. MSD is having problem with these. This will get you started. It sound like a carb problem. Go back to what ever springs where in the distributor to start and work from there. You need to see how fast or slow the timing comes in on the motor, It should be all in by about 2,400 rpms on most motors. Check with a mustang group and see if some one has the same setup as you. Rick L.