Trans Dapt or Mancini for Slant 6 to 440 swap?

I am not a fan of paying someone who ripped off a design and did a crappy job. Schumacher instructions are top not, the mounts are top notch, and they are built correctly unlike Trans Dapt. Schumachers customer service is incredible as well, he even helped me out with instructions for the Trans Dapt kit, which is about as above and beyond as it goes