Also, on the fuel lines. I'd order the gas lines for a 70 or 71 Hemi or 440 6 pack. That way you will get 3/8" and get the return line.It'a what I did for my 71 318 car which now has a 440 6 in it and it runs great in the hottest weather with no vapor lock.
You will also have to have to order the vapor line that hooks to the vapor,charcoal canister for your 74. I'd recomend hooking it up to your passenger side breather on the valve cover if your not gonna run the charcoal canister. If you have one(charcoal canister), I'd run/use it.