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the C6 will bolt rite up. you will need a 460 auto trans flex plate.
you will also have to extend the wires from the clutch interuptor switch to the neutral safety switch. and drill new holes in the frame for the cross member. pull the manual steering column, and pop an automatic column in.also hook up the shift linkage. cover the shifter hole in the floor. other than that it is an easy swap.
it took me 3 days to do the whole thing on my 89 diesel.