904/904 lockup

Thanks for the help I will be picking up a 904 lockup today for free.
Was told that it cam out of a 79 Aspen that had 36K on it. I will also be getting the engine from the same care a slant super six for $400.00 They have been sitting in a barn since 1982 I hope they are not locked up.
Thanks again for the help.
Richard Kennedy