What’s parts will be needed that ive might have missed for the swap or has anybody done this type of swap? I will be getting a LS 427 1500 to 2000 hp deciding witch package to go with and it comes with full engine and transmission everything from wires efi kit, wires. The Whole works from motor to transmission I will just be adding headers, exhaust line , upgraded drive shaft, rear diff. The thing I’m stuck on is this so called swap in and out plug and play since am going from LT to LS 427 anybody have experience on what I might need for it to fitment issues ? New transmission crossmembers ? Motor mounts I just want to make sure there’s is nothing missing or I might be over looking prior purchasing. I understand if it was old to new but am here going from LT to LS on the truck project truck I must say. Anything helps those who have experience. Thank you