Rebuild Runs Rough

Rebuilt my 318 after a thrust bearing failure, installed in Duster and doing some tuning but it’s sick. It will start and idle ok, but not great, rpm fluctuation of 50-75 - like a misfire. Worse when warm. Take it up to 3000 (no load) rpm, acts like it has a misfire, rpms fluctuate too.

Engine is a 318 magnum, rebuilt short block, new rings. < 1 hour run time.
Turbocharged, 218/218 cam @ .050, degreed within 1* of spec, 113. 115 lsa
EQ Heads have been cleaned up and unshrouded to lower compression, probably in the high 8’s:1. Compression was 9.15:1 before cutting them up.
I run mega squirt efi with E85. Ran great on previous engine build. Didn’t run as rough as it does now.

I used the same fuel and spark timing map as before. Making slight mods. I first started it up and ran it with 18* spark advance at idle. Hates it, runs rough. It cleans up as I retard timing to 10. Run it up to 3000 @ 33* - same thing, runs poorly and like a misfire. I retard to 23*, runs better but not great, loses 400ish rpm and afr enriches (I can tune fuel and spark on the fly) I have verified spark advance on the balancer.

Ran compression test tonight. Maybe the valve seats are jacked up from port or rings/bores are total ****. All cylinders are 112-122psi at 6150 ft. Elevation.

Unique build and engine control indeed, not exactly sure what I should chase next. The retarded spark advance is fooling me. I’ll try and post a video, pics tomorrow.