The rep that told you to run both is wrong. You only need the .8 ohm MSD resistor.
I have called the MSD tech line a couple of times an found for the most part the folks answering the phone don't know much about their products. I don't recall if it was on this forum or another but some one was having issues connecting up a timing retard box and the tech rep told him to wire it like it was an ignition box completely different than the instructions.
Having been an engineer for more than 30 years now and having dealt with both customer service and technical publications it is my opinion that you should follow what the instruction say over what a tech rep tells you. The reason being is that the instructions are either written or reviewed by the engineers that design the product where the training given to tech reps is not reviewed by the designers. Also, as a company gets larger and has a more diversified product line it becomes all most impossible for a tech rep to know them all. A good one will not bs you and will hand you off to some one that knows the particular product.
