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Sorry for the delay in responding, got sidetracked. Thanks for the welcome! I’m retired from BNSF Railway. I have this car (70olds cutlass supreme holiday) for quite a while. Had a few things done as money permitted. Now retired and less money; need to learn to work on it myself. So, here I am. My project.
Congrats. I've always liked the 70-72 Supremes. If you don't have one already, get a 1970 Chassis Service Manual. Only buy a paper original. There were never electronic originals, so any reprint or PDF that you find today has been scanned from an original and details (as well as whole sections) get lost. Second to that would be a 1970 Fisher Body Manual.
Welcome aboard! As Joe stated in the post above, those two manuals will help you more than anything else. The CSM should be your first purchase as it covers all things mechanical. Yes, we have a combined wealth of personal information on all things Oldsmobile so don't hesitate to ask.