Are you using AL or iron heads? Open chambers? Quench? AL heads are good for 0.5 to 1 full point more in detonation tolerance, and open chambers detonate more readily than closed ones. Plus the Edelbrock chambers are fairly smooth out of the box... Let's be sure to compare apples to apples. It sucks that the west coast is stuck with 91 octane...
BTW, OP..... .032" quench is getting too tight IMHO.... the pistons will rock and piston-to-deck heights will vary cylinder to cylinder due to deck variations and rod length variations. Put the quench gap at least up into the high 30's, or IMHO preferably the low 40's.
