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Hello jimlinnell.
First of all are you sure it is a supreme? If it is the serial no should start with 6934287os. 69 is year.3 is oldsmobile. 42 is cutlass supreme. 87 is holiday coupe. os is the plant it came from, Oshawa. I own one but mine has 350 rocket. on the 350 there is a production no stamped on the front driver side of the block. You will need a mirror to see this or maybe from underneath. from what I understand, this no should match the production no of the car. I am not sure if 455 is the same. There is lots of info on the net. That is where I got all mine and I aint no Genius. Where are you from? Im from prince Edward Island Canada. Let me know more about this car , you dont see too many 69 supremes around . In fact mine is the only one I ever saw.
GOOD LUCK!
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