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Simpson makes the Diamondback
There are numerous versions of the 80a pump with different flow. If you have a 80-1 I think you will be ok, it is "supposed" to be a 7 GPM pump....
All of the rear engine mudracers I have ever seen runs the fuel cells behind the motor because there is no room (limited to 150" wheelbase max)....
you can use a MSD mag with a mallory base. You just need to get the correct mag driver for you off-set. Call JR at RBS, he will get you what you need