Small Block & Big Block Chevy Specific - big block in a 1970 corvette

i am currently putting together a 1970 corvette with a big block and some stock brackets i found one of the brackets has this number on it "tp28389u" the others have none i'm trying to put it together need help, anyone ?

cant remember where the brackets came from

any way you can put a pic of it up on here it would help us out knowing what your talking about

i am currently partially restoring a 69 vette for a guy . it is a 427 car and i can help you out with the brackets. i will get the name of a company that sells all the correct brackets you need.