42 re 5.7 hemi install duster ?

I don' know I'm trying figure a way get a trans and deal with no kick down linkage issue and not have to chop up my car floor board cause I'm not a very skilled welder afraid of warping it just looking for suggestions.

The kickdown is not the issue. This transmission is electronically controlled by the original PCM. Again, I don't think the hemi computer will control an 42/ 44/ 46 RE series. If you get the OLDER so called "RH" (means Hydraulic, not Electronic) all you need is some electrical to trigger the lockup and OD solenoids.