Picked up a 70 Camaro. Amazingly enough I did find the build sheet on top of the fuel tank. The guy I purchased it from bought it in 1977. The car was hidden under a false identity since 1975, someone put a 74 front and back end on it. Once I looked at the car I new it was really a 70, and with the items I could see at a quick glance, I new it had to be at least an RS (Hideaway wipers, Z21 Trim, deluxe interior) and it wasn't a Z28 (had Air Conditioning). At that time I stopped asking questions, rolled the dice, and loaded it up. I really didn't care if it was a plain Jane Camaro, I just wanted to build another 70 Camaro. Finding the build sheet was a bonus and is one of the most exciting things about buying an older project/barn find car. The build sheet is in rough condition and some RPO's are hard to make out especially if you've never viewed other 70 build sheets. I estimate that the build sheet should have around 38 RPO's on it. I can make out 28 and a 3rd of them. The sheet is torn off and missing everything above Z87 and it has another Z right above Z87 which I believe would be Z27. Z87 is pretty low on the build sheet, so I think it has about 9 RPO's missing. The stock AM radio was still in the car, along with the stock windshield (cracked up very much so), but has the antenna, and the stock rear speaker wire was still there. So that would be U63, U76, U80 the interior is deluxe and rear seats still had the blkw/cc (713) and I think would be YO2 and YO3, lots of floor deadener in the car (Y05). Front seats are from a 69. I think Y10 would be there, but not positive what the custom trim would include. So that leaves the question, Z21 or Z22? I'm still missing 1 other RPO if there is 11 in that last column. So this is why I was interested in the invoices or copies of the build sheet. No luck with either. I removed the original headliner and dash in hopes of finding another copy, no luck there. Any insight/ideas would be greatly appreciated. Maybe there's something above the RPO's that gives it away as an RS/SS. I know there's many folks out there in the Camaro world that know more about these build sheets than I do. It's getting an RS front end regardless.. I'd like to follow the build sheet a little bit though, but it'll never be a numbers matching car, but as I said earlier, I just want to build another 70 Camaro (era correct would be cool again this time around). Thanks, any feedback is greatly appreciated. Questions are. What does the Y10 trim include? In the list of RPO's, does Z22 push anything that Z21 didn't push. Remember, car had front and rear changed out to 74, so no obvious RS parts to look at.