Hey troop! Ive got a 1956 Pontiac Star Chief 2-door hardtop with a dead 316, wanting to build/swap my 1959 389 out of my Bonne and use either the 56 Hydramatic or 59 Hydramatic. looking for Ideas on stuff. Thought about punching it to a 400, Ive read my 59 motor will take it if sonic tested, but?.. Also have a 58 370 tripower motor stashed, but thinking the 389 would give the best bang for the buck. The 370 is kind of an orphan anymore. I see Butler performance has nice mods for 389's but they say my crank trans pilot hole will be an issue. Been doing some home work on the Safari site, they say what fits, but not much on horsepower upgrades internally. A good cam suggestion would help. Ive read my engine design is limited to pre-1961 automatics. Cant shift much anymore, getting to old and broken, so I want to stay with an automatic. Any ideas, help appreciated. Links to previous topic discussions would help , too. Im in need of a 57 Poncho or Olds rearend, also, if available in Oregon or Washington.