I just finished putting a chrome pan on in place of my original, leaking pan. I have a 396 in a '70, and it was a real pain. The manual has specific instructions on how to do this, and only in the 396 (as I remember) did they have some special instructions, I am not sure what would be different for a 454. Anyway, I spent a week trying everything, and once I gave up and disconnected the trans, it was a piece of cake. The distributor, fan/fan clutch and radiator shroud will need to come off, as well as the starter and headers. The manual said to remove the radiator cover so the radiator can "move" a little, and that helped too. Then I pulled the engine up a few inches and the pan dropped right out. But the transmission has to get out of the way or you will never succeed.