[John Poling]

Good Morning Tony,

For what you say you are intending on using it for, you will not need a C-6.I personnaly would not have chosen a C-6 because it is just plain overkill for the weight I am pushing, but I bought this kit started by someone else and they thought that the C-6 was the better choice. I know a lot of people that are using a built C-4 behind high power small blocks and one or two people that are using a C-4 behind a big block and they have not had problems. Most of the people are running these combo's in Fox bodied Mustangs which are heavier than most all Cobra's out there. As far as determining the required stall speed there are all kinds of things you need to consider, you will need to take into account big block or small block, power/torque output, grind of cam, weight of car, rear gear, cruising speed on the hiway at 65mph (for a street car not race) etc... Keep in mind that you are not going to be pushing around nearly as much weight in a Cobra as you would in an old Mustang, so theoretically your stall speed will be lower in a lighter car.

As far as choice of where to purchase, that is completely up to you depending on your financial and mechanical abilities.

Did this help? If not, please reply with more questions.

John