How far is your motor set back?

The reason for me making solid mounts and not buying them was to design a kit that consists of two motor mounts and one transmission mount. These will let you set the motor back in 1” 2” and 3” increments . Like my 72 TwIsTeR can be set back 1” with no damage to the car. Now lets say your not worried about that maybe you have an aluminum fire wall with plenty of room then you might want to go back 2” or 3”.
Yes I made these for my slant car now. When we put Dodge Girls TwIsTeR together we are doing these for her. It has a V8. Just asking the racers, does this help launch? Handling? What gains do yall get from a mod like this? Thanks for any input received Don .