[Ipafrank]

Hi, I'm replacing the 250 i6 in my 66 C 10. Purchased a donor 2004 Silverado crew cab with a 5.3 4l60e.
The motor plate, perch, mount info is a little unclear to me.
Do I need to purchase new plates,mounts ( clam shells) and perches.
Is there anything that can be reused?
Any recommendations as to best fits.