I have one on the 360 in my 68 Barracuda and the engine does not like to take throttle until it's warmed up in temperatures below 45 degrees. I have driven the car in 20 degree weather and it can be 4 or 5 miles before the engine does not need to be feathered to take gas. My car is a manual which makes it easier to deal with than an automatic. At 40 and above it takes about a mile or 2 before it's happy.
Exactly the way my wife's car acts... kind of a pain!