Qlynxer

Another question. I attached an aluminum mounting plate on the gm module but haven't mounted the plate onto anything, just kinda dangling around. Does this thing need to be mounted and grounded?

Ok going to make it quick and to the point. Purchased 72 240z with original engine and 280 dizzy and msd coil. Car ran good but would randomly shut off. No sputter just instant 0 rpm. Pull over and usually would start again within 1-5 min. Took to z shop, tech re wired coil. Previous owner had left ballast resistor and mechanic said that it coulda caused problems. Mechanic gave me a stock 280 coil and said it was more reliable. Car ran fine for a day then same problem. I swapped over to the 280 coil but still same thing. Read and read. Found out e12 80 module might be problem. Swapped over to a gm lx 301 type module. Fired up car and now won't start at all. Switched back to the e12 80 but now won't start. Changed back to msd coil and nothing. Any ideas? What should i do now? Carbs were tuned up when in shop. Im getting no Spark when I pull the spark plug wire that goes frm coil to dizzy. Hate my first post to be all problems but I have read and searched and need some help please. Thanks Quan.