Im doing an LS Swap with an 02 5.3 from a donor Avalanche in my 66 Buick LeSabre. My question is does anyone know the angle of the 66 Impala or Buick Special filler neck for the tank? They don't offer a conversion for my car and was thinking of getting a tank from one of the mentioned models, cutting the filler neck off and welding mine from the LeSabre. The dimensions of the tanks are all the same....not sure of fitment or filler neck clearance. Thanks in advance for the help.