The engine: 7.4L TBI out of a 1992 Suburban

I've been searching the internet for some time trying to find the factory spark advance table for this engine. Specifically, I would like to see actual timing BTDC based on Ign Load % (MAP) vs RPM. Is this information that you tuners can easily extract from the bins? Maybe its in a different format than MAP v RPM?

Did these advance curves differ between different years of the TBI 454 and if so, was there a "better" one in terms of power and/or fuel economy? I'd be interested in looking at the different variations, if there were any and I welcome your thoughts and opinions on which you prefer or your experience with them.

I appreciate your input and hope I've come to the right place for this info...feel free to re-direct me if I should be looking elsewhere or if this has already been covered.