Unless you use shift linkage from a newer (67') with a factory 3 speed auto, you'll have to modify your stock linkage. Otherwise you won't be able to pull it down into 1st gear. If that doesn't matter, simply swap it in and get the appropriate kick down cable and bracket.
What gear ratio is in the rear axle? A properly tuned 283 should get at least 16 MPG. Most get 18+ in my experiences. (unless strapped to a heavy vehicle)
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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