You are running 98.9 octane. If you have a motor built that is at 9.5 or below, too much octane will reduce engine performance. I used to run a blend of 70% 94 Sunoco and 30% 110 unleaded in a 428 with #48 heads 0 decked at 11.2 to 1 and ran awesome to low 12's in a 67 Firebird with 3.55 gears.
If you are running a stock 400 with 72 cc heads with no milling to block, piston CC or motor, you will be right at 10.6 with a .030 overbore. Then yes, the blend would be appropriate.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
