i need someone to give me advise.
i want to put a 454 bbc and stock 454 trans in my 84 camaro. its orig. a 305 carb.

how hard will it be to do the engine swap and what do i need to buy to do the swap?

 

Hard. You will need the complete engine, transmission, B&M shifter conversion kit, torque arm relocation mount, engine mounts, bigger radiator, fan, hugger headers, all the accessories, drive shaft, cross member, transmission mount, most likely a new rear end (eventually), and tons of other stuff.