Im lost at this stuff.... HELP?

Ok so I have a 1974 swinger with a mild 360 getting ready to swap out a new cam to a purple mopar or a voodoo, I still have the stock 904 and TQ and stock 8 1/4 rear with 2.45, my question is I am tight on money, should I buy a bigger TQ first or swap gears out to higher gears for the rearend? I know they both go hand in hand but what one should be done before the other?