Hi All. I think I finally found out what the problem is with my 68 Imperial engine. I took out the distributor to put in new points and when I looked it over I found out that 4 of the points on the cam are worn out and that 383 will not fit the 440. I am going to order a new one today and if this fixes the problem we will be at C@x with the car next month. Hope to see you there Bob.