High compression with aluminum heads and pump gas???????

416cid/alum/9.7Scr/7.74Dcr/63*ICA/91octane Calif spec/.030Quench/full timing up to 31*/750altitude

416 cid 4" stroker 0.030 over 340 block.
aluminum "63cc" Edelbrock LA heads measured at 64 cc actual
9.7 Scr measured with CC'ing heads, micrometer piston height
7.74 Dcr
63 deg ICA from here: Comp XE274-S solid http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=670&sb=2
91 Octane California spec gas "up to 10% ethanol"
0.030 quench
full timing up to 31 degrees
750 altitude at my home town

2500 ft altitude at Willow Springs Raceway.

Dcr calc here: http://www.wallaceracing.com/dynamic-cr.php

On the verge of pinging. Will ping going up long steep grade full throttle acceleration starting from 3,500 rpm (75 mph) upward headed toward 5,000+ rpm.