Found an older guy who has this motor and transmission that took as payment for a job. It's been sitting in his garage ever since. Here is all the information I have so far. Its a YH engine. The only other number from the block he gave me is 153146. I asked about the heads and he emailed that it has 16 heads and he couldn't read all the date code only D15.... I think it will be a high compression engine. Is there anything you guys can tell me about this engine or what I should look for? He has never heard it run.