Gen 3 Hemi moto mounts – best option?

I'm putting a 392 hemi in my 70 challenger convertible and at the point where I need to buy motor mounts, trans crossmember etc. I saw these Mancini Racing mounts which look functional but I know there's lots of other options. I plan to use the stock k-member and will do some boxing and strengthening of it based on what I've seen others do.

I'd like to hear from people who have "been there, done that", what's good and why did you like it?
Author: TripleBlk70