As a general statement, an 8" booster mounted flat won't clear most valve covers, certainly not LS with coils on the covers. Some kind of offset is required.
Also, the offset mount and angle allows a direct, no binding, connection for the booster pushrod to the brake pedal, 1" up from stock location, changing the pedal ratio from 6:1 to 4:1. This reduces the pedal stroke and the overall result is a brake system that feels similar to what is on a modern car.
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