I've got a customers car in for a cam swap, its a 97 LT car with a LS1B 00' PCM in it, and a L92 from an Escalade. Someone already had deleted VVT and the car runs but not correctly fueling wise. When I went to tune the car I noticed that fueling adjustments were doing nothing. I have the car forced into Open Loop as well as Speed Density Mode for the time. DFCO is off as well, I realized that the PCM is running off the backup VE table. First thing I thought is what's going on with the reluctor setups? I know the L92 is 58x crank and 4x cam and the PCM will only read 24x/1x. But I assume if this was wrong before the car wouldn't even run? Would it? This is a new one for me.....any info would be greatly appreciated. I've tuned boat loads of these cars in SD and MAF and have never seen one run off the backup VE table. What causes the PCM to even look at that table?

Thanks!!
Mike