You should be fine with or without the msd but it is not a bad idea. I would go with a digital 6+ because it can take timing out when you use the nitrous and if you decide to go with a bigger shot than 70 to 100 it will be a real good idea and will even add a little more safety to a 75 shot. Either way as long as you have a good coil and a colder set of plugs you should be fine.
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James Cox
nochevy@hotmail.com
1991 Mustang LX