I'd pass on the weapon r i/m. Getting the head decked or milled, you'll run in t/c lenght, unless the tentioner can take up the difference. Probably can, just something to think about. I'd figure out the c/r of the 20 vs the 23.
Introduce Mr. Torsen to the mix
Bigger brakes then you- D23 crew- D-Tech- Sedan Revolution= #131