Hey Everyone, I am getting ready to pull out the old 240 6cl, and put in its place a 289 v8, This will be going in to a 65 F100 I would like to run headers but have questions about what will fit, I dont know if to keep the stock 3spd or switch to auto I have a c4, But dont know wich would be better? OR if that affects the fit of the headers? input on this would be Great, Thanks Bill W