The '749 directory contains information related to the 1227749 ecm for super/turbocharged applications. The '730 directory contains some of the bins I ran on the vette in the last two yars. the '165 directory contains two base bins used, one for automatic cars, and the other for manual. Both are based on the vette platform and have slightly aggressive spark tables but can be used on fbody. For updated bins, and EFI information, please check out Craig Moates site. www.moates.net