Hi Robert, From discussions I've read about GM-HEI on an MG the only question was if it was properly curved for the HP that your particular set-up is producing (although it seems to make so little difference the same dizzy is used with single or dual carb set-ups)-probably is more important for high performance interests. Faced with a similar decission, after much research I went with Brit-Tek's Ultimate ignition kit for a couple hundred bucks less (with Pertronics a little more) and have been very happy. FWIW
Tim