The "easy way" to go 10s and have street manners in any mopar is with a big block.
Hey who wants easy? The "fun way" is with a screaming small block.
There is no doubt in my unmilitary mind, the GTX was a high 11 second car in street trim when I owned it. It beat cars that ran 12s at the track without any problems.
318 has 2 nice Dusters that he wants to keep as comfortable street crusers not radical race cars. I am sure he can have his cruser run low 12s without to much trouble and still be user friendly.
As for me I have a lead foot and like to go as fast as I can, that's why I sold all my race cars and parts back in the 80s.
The cars and parts I have now is round two and just for enjoyment. lol