I have an 85 T/A with an H code 305 in it, it also has a Rochester 4 barrel carb that was on it. I recently changed it out with an Edelbrock 600 Performance Series carb. The factory carb had electrical connections on both the top as well as the front, and naturally the replacement carb. does'nt. The distributor that is presently in the car has no vacuam advance setup on it & I have been told by friends that I need to replace that dist. with 1 with vacuam advance on it, so that the carbs vacuam and not the computer will be advancing the timing. My problem right now is the fact that all of the distributors that I'm looking at have a 4 wire module in them and the one that I have presently has a total of 7 wires hooked to the module, 3 going from the dist. to the cap and 4 coming from the side of dist. and going to a plug on the firewall. Any advice as what steps to take next ?? I'm really not sure what to disconnect at the present time. Any assistance will be greatly appreciated, Thanx !!!

 

Is your new carb computer-controlled? If its not, I'm pretty sure you have to replace that distributor with a non computer-controlled unit, such as an HEI. If you go this route, you'll definitely need a new cap and coil. You can get them with or without vacuum advance (most will have it).

As for the wires, if you get an HEI, the new distributor will have 3 wires from the side to the cap just like your old one, and of the 4 wires you have, only 2 of them will go the the cap. One is the TACH wire, and should be connected to the tach filter. The other is the BATT wire (it'll be the thicker of the two), and goes to your old coil. The new coil should be stamped which terminal on the cap is TACH and which is BATT. As for attaching them, you will need to go to the junkyard and get the HEI specific connectors, or, if you can't find them, you could also get 2 crimp-on female spade connectors. Hope this helps.