The new flying dutchman!

[EZ Nova]

Benny, without the cam specs and rear gear, I see a few things you can try. CARB? I thought you put on a 950 CFM???

Your heads are HUGE for that combo? NEED some more RPM for sure with that 320cc (plus) intake port and 2.25 valve head. At 6500 RPM you have no real velocity to cylinder fill. I don't know if any work to yhe heads or intake, and I'm not familar with that Weiand intake. I would try 7500 in a hart beat, BIGGER carb and more RPM off the line!

Example:
My '69 Nova SS 396 car. ALL STEEL, 4 sp bench seat, 12 bolt with slapper bars, OEM rear springs.
Motor, 402/375Hp OEM short. Yep standard bore and OEM standard crank and rods. ARP bolts and TRW factory replacements. 660 Comp roller. ’70 LS6 closed chamber heads with Manley 2.19/188 valve with 5 angle grind, port matched to Holley strip Dominator and 800+ Double pump Holley (reworked).
M21 and 4.56 gear. Lakewood 90/10’s and 50/50 shocks with 9X29.5 firestone slick.
FIRST FULL and ONLY ¼ mile pass, 10.47@126. Made 7 1/8 mile hits. Started with 7.11 and getting to 6.8? I recall. Got booted after that 10.47 for NO ROLLBAR. Just a street car with junk/OEM stuff. Even ran the rally rims. I’m sure the car would have went a 10.TEEN. THEN there was the nitrous but never used it. Think it would have ran 8’s.

Now my other motor, 427/390Hp motor. Oval port 12-1 motor, .620 solid cam, 12-1 street motor, that also went 10.50’s but more street friendly.
Now putting together a 475 inch ‘052’ ZL-1 block, ‘074’ head, ‘163/198’ intake again going into the streetcar, looking for a VERY low 9 and look completely stock.
Now you see, today you don’t need much of a motor to run 10.0’s or better. Look at John Wilson’s ’67 PUMPGAS 496 Chevelle with OEM (781’s) ovalport heads. 9.50’s on a DOT tire.
John