You can save $ by drilling out your stock units and running a bolt through. Lot of guys have done this. I bought the Merchant mounts a few weeks ago and they will be installed when my built motor goes back in. FWIW my stock driver side mount cracked at around the 600+ HP mark.
We have pulled out mounts in relatively stock trucks that have been destroyed by new england climate and fallen out in pieces. Also, have bolted some that have been partially ripped already between 400-600 hp
The issue with bolted mounts in a high HP application is that many times they still wear through. They will last a while though, more in non competition trucks.
I did the Johnny boy bolt job on mine when I did the build. That was almost 5 years ago this July and 79k miles as of right now. If you want to save some coin can do that or the Ma mounts there nice. I also sell those if I can help you just pm me.