In the description on the motor mounts and instructions it should say that some alteration may be required. On the TTI site for both the headers and motor mounts it tells you that you can't run power steering(Need to change to Borgeson pump and unit) and you must move/relocate the oil filter to remote in an A-Body.
I just finished with my install the headers are tight but clear(Need to relocate brake proportioning valve), the motor mounts went right in place on my stock K frame. the 904 Trans bolted right up. exhaust is slightly different from my old SB setup with TTI headers. Every step takes some thought, you just cant toss the new hemi in and expect every thing to just be perfect. Keep in mind when the aftermarket companies develop these parts they are using old used up cars that were built by guys and gals that had the mind set of "close enough for today" thought process. you have to be able to roll with the punches doing a swap like this. for me it was fun and therapeutic at the same time. did I want to just pull the plug and go back? yes a few times but I chose to keep plugging along. when you turn the key and it fires up in less than 1 second, all the pain and suffering is gone and now you look forward to enjoying it and adding more cool stuff to the car. Like Air conditioning, getting the wind shield wipers hooked back up. maybe go for a 50 mile burn and waste some fuel, Just for the hell of it.
I put a legitimate junk yard motor in my dart for a reason, to see if I could and see if it would run. well I did and yes it runs so I have done what I set out to do(I did it Roadkill style). now its time to get it ready for next years drag week or maybe a power cruise. time will tell maybe even sell it and move on to my next project.
Its all worth it at least for me it is to this point.