Again as some of you know Im helping a friend install a 4bbl intake and carb on his 78 f150 351m. His truck has A/C and cruise and he would like to keep these also. There are some vacuum related things like diaphrams and a round black thing about the size of a spray paint cap with four lines coming off of it at the back of the motor by the A/C box. What are these things and do we need to keep them? Also any pics of a 351m/400 with vacuum lines A/C and cruise would help. Thanks again.