My 2 cents....
The acoustics and inlet design of a "63 or a "93 wont give you the noise of a vl turbo,It just wont happen.
Ways to get it though include....masive cooler piping,massive intercooler,massive inlet pipe with no airflow meter etc....The greater the volume of the inlet section (after the turbo) the bigger "air Spring" you have bouncing back and forth,therefore the noise occurs....a big turbo helps to.
So unless your gonna go 800x500x76 cooler with 3 1/2 piping and a T66,your car probly wont ever sound the same.