I am converting my 1987 Ford Crown Vic (5.0, FI) to a carb with 7.5 high-rise. It is currently FI, but I am intalling a 650 Holly and high-rise for a project street car. I've read that the heads currently installed on this 5.0 are also used in trucks?? I also have a set of 1960's heads from a Mustang 289. Which is best to use with carb?