Bill,
I didn't take the "Longevity' thread response as snarky at all. I thought you meant what you said but I admit it surprised me. I didn't think a history of non-compliance supported continuing the trend.
And I agree that certain sections of the standards bear more weight than others, like fuel and exhaust systems.
Here is a free link to ABYC Standard P-1, Recommended Practices for Exhaust Systems. Click on the download link to get the pdf. At the top of table 1 found on page 6 you'll find the allowable materials for dry exhausts (hot section) on gasoline engines.
If you feel that the ABYC specs on exhaust systems is one of those important areas, it may help with your hot section rebuild.