8 1/4 durability????????????????

i though i may highjack this thread alitle now that it has been cold for a wile
my question is about 81/4" ring and pinion stuff
i have been looking around some for 4.10:1 gears for my rear and i have found mark williams and richmond wich one do you gusy think is the best choise for a streetcar? i want a ring and pinion that will last on the steet and take the abuse when i do some racing on sticky tires...