70 barracuda jack how do i tell weather its rite

i have a 70 barracuda jack assembly w/ base and hook. i mixed them up with 3 others i have from different cars and now i don't recall which is what? are there numbers on them?

Yes.

The hooks should have numbers on the inside.

Look on the jack mechanism for date codes, it may be stamped into the body or in the end of a rivet.

Some examples here;

http://www.hamtramck-historical.com/dateCodes101.shtml

The last 3 digits of the part # on your 70 Cuda jack hook should be 100 if the car has chrome bumpers, or 101 if it has rubber bumpers...