Tuning 85 TPI - Need spark tuning advice

[Fast355]

Sorry but the msg editor is shoving everything into one block. Hi everyone, I have a 1985 C4 TPI L98 that I am tuning. 870 ECU, AEM wideband wired into a Moates APU1 for datalogging. The engine is lightly modified, light intake cleanup and porting, 1.6 rockers, stock cam, long tube headers, no cats, dual 2.5" exhaust, descreened MAF. No smog pump, EGR system removed/disabled on chip. This is my first try at tuning, so I know the basics, but don't have much experience. Timing is stock at 6 degI have been datalogging and tuning the MAF tables to keep the AFR around 14-15. I leaned out tables 5 and 6 to get the WOT AFR up to 13, which I have read is a good value. I'm not sure if the descreened MAF has made this necessary. It was 11-12 AFR at WOT before. I thought that my engine would be leaner at WOT with better air flow from my mods, but I've read that stock WOT AFR is very rich.With my light mods, I am was thinking I would just have to tune the MAF tables and the spark advance vs rpm vs load table. The power enrichment spark vs AFR table is blank. I don't see a knock count value in my available datalogging variables in 1F.xdf. But I do have a knock flag value along with the other error code flags. I was going to increase the spark advance vs rpm vs load table values slightly and see if I could feel a difference, but I want to make sure I can tell when the engine is knocking, before it becomes severe. Are there any other values that you think i should play with to try to increase performance? Thanks

Does this engine still have cast-iron 76cc smog heads on it? I know I had a similar engine in a truck. It had a very mild 204/214 @ .050 cam in it. With the old carb HEI setup it liked about 18° initial timing. Full centrifical advance of 20° all in by about 2,600 rpm and 10° @ 10 in/hg of vacuum advance. Vacuum advance started about 4 in/hg. That gave a total timing of 38° at 2,600 rpm and a cruise timing of about 48° running about 70 mph. Idle timing was about 28° at 800 rpm. It was a 3 speed manual truck. Those iron heads gave a low static compression ratio, combined with the terrible chamber design a slow burn. It really liked the timing coming in early.If I looked at the timing map I could revise it similarly and send it to you. But I need a good log of your LV8 values vs RPM and TPS.