Need help with my 440 problems. (new to BB)

Start with ignition timing followed by cam timing. Also, and often overlooked on cars bought with issues, run a compression test. A friend of mine once got a real good deal on a 67 GT with a 440 because every cylinder had very low compression. He finally got to fixing it and found that a custom set of pushrods were ALL too long...A set of stock rods fixed his issues.