Glidden Arrow

I think 660 or so is more reasonable

An all out W8 engine that small wouldn't make that kind of power, a wedge engine making over 3hp per cube just hasn't happened.
Not so sure about that, a friends comp car @ 3200 pounds with a 258 & a 277 cube (different class) was running in low 8s or better iirc inline sbc. Ex pro stock olds 6 speed turning over 10 grand all day.