Hmmmm, I thought I misread the numbers when I first read your post, the difference front to back seemed a little odd to me. I think this would give you a strange angle at the juncture of the firewall and frame. Couldn't say for sure till I see it done on the car, but in my mind's eye it just wouldn't look good. You would see a wedge shaped section of frame below the body too.

But I've been proven wrong before.

Don