New heads, cam and intake will help
That's kind of the name of the game. Putting a 65mm tb and 76mm maf on a stock long block, your going to lose low end torque, same thing as 2 1/2" exhaust on a stock motor. I'd suggest a taller gear, 3:73's will make a huge difference and they are still very streetable. Roller rockers would help too.
Though if it's as bad as you are saying and you lost ALOT of power, you may have something else going wrong, check all the vaccum lines and timing and such.