So I have a 2001 7.3 250 crew cab. It's my first diesel I bought it and unfortunately I was unaware the engine is bad. The mechanics believe the case is cracked as pressure is building up in the oil pan and actually forcing oil back up and out of the dipstick. Anyway the truck has some after markets for performance and the mechanics say it was due to added hp the stock engine couldn't take it so I would like to put a performance engine in. The mechanics recommend black mamba but only a few seem to like them i was wondering what you guys would do my budget is 10k. If you could be as specific as possible I would appreciate it as I am not super mechanically inclined and trying to learn as much as possible. I would like the most hp for my $ but also want it to be a solid engine. I would really appreciate any information even if it's unrelated to the engine but other things I might be interested in looking into with this truck. Thank you in advance guys.