For the Corvette above, what ET/ MPH would you expect? Allow for the std. Overbore (290/292 c.i.?) prep? If they were running the 11:1 compression vs std for 270 hp (9.5?). The 61 would dial in better than the 62 with the 327.
What made the "big" difference in the 1961 Corvette ~ 283/270 HP 'Dual-Quad' Engine at the Drag Strip.
In 1964, the NHRA permitted the use of the #3782461 'Fuelie Head' as a Factory OEM Replacement for the #3774692 Cylinder Head on the 1961 283/270 HP Engine.
Instead of 1.72" Intake Valves, the 283/270 HP now had 1.94" Intake Valves.