First off, thank you for any advice. I am finally at the point after years of work and thousands of dollars to start on the drivetrain of my 67 Camaro. It is not a special car but it has made it over 40 years without being molested. I really want a 5 or 6 speed manual but can not bring myself to cut the car up. It only has 57,000 miles and has been garaged for over 20 years. It came with a powerglide and I want to use this car as a driver once it is done, so I would really like to install an overdrive. What type of automatic fits with the least amount of mods and works the best? Being old school I have decided to stay with a carb mainly because I want the idle of an old school cam and I might even install a single carb tunnel ram. I plan on keeping it under 450 hp and I am doing this mostly because of the Camaro I had growing up. I am not doing it to race or be the best of show.