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Hello
I'm the guy that put the M120 into the 560SL. It would go into a pre 1975 450 just as easily as they are essentially the same everywhere that counts. If you go to the performance paddock there is a guy taking orders for custom bell housings at this time. The M120 transforms these cars into a 21 century cruiser. You will get 12 - 13 second 1/4 mile performance and over 20 MPG all with very very smooth performance.
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