I just took a '69 Firebird out of storage and had a compression and leak down test done to see where the engine stands. The motor is a 350 with 400 heads and a 4bbl Rochester. Compression ranged from 140 to 157 and the leak down put up ranges from 40-57%. Curious what these numbers mean and if the engine is in decent shape or needs to be rebuilt right away. Thanks for any help.