Hi Rusty,
Assuming your goal is handling performance ... you do NOT want to put any additional weight ... especially 62# ... 36" behind the rear axle line.
Packaging stuff/weight in a car is one the challenges we all face in building a car for performance. For road courses, autocross & spirited curvy road driving ... ideally, all 4 corners would weigh the same statically, and ...
* The majority of weight is inside the wheelbase.
* The majority of the weight is as close to the center (both ways) of car as possible.
* The CG is at a height optimum for the speeds the car will spend the majority of its time running in (low, but how low is the question).
* Build the car as light as is practical & safe. Lighter cars accelerate, decelerate & turn better ... period. So don't add a bunch of weight to balance the car if you can avoid it.
Add the 62# 6" below present the center of gravity sounds very good.
And if you achieve a streetable g-machine with 51F/49R, that will be better than 90-95% of the cars built. So, good job !
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