I recently put a 750 cfm Holley on my 1967 Ford Mustang 289 with a C4 Transmission. I also put on a hi performance intake as well. ever since, my transmission will not upshift or downshift, and it slips out of any gear a lot. whats wrong here? There is a kickdown on the carb which is not active because on a 1967 the kickdown is connected to the petal linkage. thank you for your help.