Hi me again 32 roadster looking for tri carbs but getting no where so going down the route of tunnel ram with twin holley

The 460 i have , so i have been told came out of an air force econoline van that was side swipped, 30,000 miles on
i dont know if i should leave it aloan or rebuild it , but would like to uprate the performance without going to wild (street /Strip)
doess anyone have any ideas on a shopping list of parts i should change to do this , and where is the place to shop (www) for me to ship to the UK , not many place here to get parts from


Cheers

Speedy (craig)