RE: Home made P - 82 mustang
The problem isn't torque... it's the serious mismatch in thrust between an engine running on one side with the other dead!
With the long nose moment on the P-82, such a mismatch regardless of thrust offset is likely to be fatal, unless it occurs at a high enough altitude to permit some chance of recovery.
I doubt any thrust offset would help at all.
If the plane is sufficiently overpowered, as I expect yours to be, takeoffs should be OK, with the much longer tail moment and larger verticals. Expect to hold some right rudder when the plane begins to accelerate, and ease off as it picks up speed.
Downthrust.. HA!