Wrong. The 1405 can have the choke added easily. The difference is exactly as I described. The 1406 is very lean. The 1405 is tuned for performance. There's a thread on it around here somewhere showing all the differences. The passages in the boosters are different. The boosters themselves are different. Good luck if you get the 1406. Unless the engine is truly dead stock or really close, you may have trouble. If it's really over 9:1 compression it's going to want more than the 1406 I believe.
