little help? confused on my engine mounts

[Ta2edjr]

Putting a 5.3 in my 72 and I don't think I'm using the right frame mouts. I pulled these mounts from a mid 80s model truck but they arnt like what everyone else is using and I can't seam to find any pics of these online. They use a clam style mount but they are different and I cannot for the life of me get the engine to bolt up in the truck also if it worth the info the truck I pulled these from had a 4.3 in it the first pic is of the mounts. Second pic is of the driver side bolted on third pic shows how far the mount is off. Any and all help is appreciated