Welcome to the Stovebolt. I am also working on a 3/4 ton truck. Mine is a 52. Have you considered a cross member made by one of the members here?

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=688682&page=1

I bought one from Scott for $480. I didn't have to pay shipping as I met him on his way to his new house here in WI. So far this one seems to be the best bang for the buck, you use all stock parts for suspension and brakes. OR you can go complete aftermarket.

I can tell you the kit seems top notch. I am looking forward to trying to install it this winter.

But to answer your question you have to attach the Mustang II front end to the existing frame. Someone will be along shortly to explain some of the ways other members have done it. Here's a thread on it:

https://www.stovebolt.com/ubbthread...ds=mustang+II&Search=true#Post679855


Some people say I suffer from insanity, in reality, I enjoy every minute of it!