Ignition table guidance

I am currently tuning my car using EFIsource Microsquirt. I got it running and idling very smooth. I am just looking for some guidance on ignition table. It is the base map from efi source and the only area i have changed to this point is the idle area. I have heard these cars can handle more timing with aluminum heads and i do not want to overtime it while im still using my ported e7 heads. Mods are listed below. Thanks in advance. (FYI so i dont get any backlash lol, i do plan on changing to aluminum heads and a better suited cam but would like to tune as is for now)

1988 Fox 5.0
347 stroker
+6.5cc pistons
10.1:1 compression
ported e7 heads
rpm performer 2 intake
f303 cam
Long tubes
EFI source Microsquirt
18* timing at idle

One other thing i forgot to mention is that i am running KB hypereuectic pistons, and i believe they recommend running slightly less timing?

How does this look for 93 octane??

Actually im not sure what happened there lol. I think i meant to interpolate and might have copied it by accident. Ill get that fixed now and go from there. Thanks!