[buzzinhalfdozen]

I've been reading this post and there has been alot of good suggestions mentioned here. Two things that grab my attention are the 3000 ish RPM limit and new switches being installed. The RPM the problem occurs almost seems to be a clue, I've encountered these issues due to several different things, low battery voltage, improper triggering of the ign. controller along with obvious things like loose or ommited grounds. I noticed Pat Collins had asked you to check the wire colors from the Dist. to the MSD, very good idea as it takes a short amount of time to actually look and be absolutely sure they are correct, I've caused myself many head aches by assuming things. My self I believe the first thing I would do is put my trusty MSD tester on the car and spin her up to make certain the box and coil are up to the task. If it sparks all the way up we can say the control box and coil are OK. During this test may be a good time to put the DVOM on the Batt. Pos. as well as the switched pos. ( small red wire) to make sure we have sufficient voltage. Is it possible your new switches have an issue such as a large voltage drop thru them, testing in this way will tell you. As with any problem we need to break it down into smaller units and test the units that we can, by eliminating one unit we can concentrate on the next one and so on. No testing the carb. thats another story, as others have mentioned it may be easier to swap one out and see if you get the same result. Belive me I understand your frustration trying to isolate this concern, I deal with these kind of issues every day, unfortunately no o9ne can give you the magic fix via the net however I'm sure by properly testing the things you can test you'll resolve this problem. Good luck Joe