I believe the 70 W-30 engines were a bit more unique than the 69 H/O. The 70 W-30 used specific "F" heads (arguably the best Olds heads, except for maybe the "C" castings), special exhaust manifolds, aluminum intake, much wilder cam (328 duration in the 4-speed), and was available with the W-27 rear end.
I always wondered why Olds chose the red inner fenders for their 66-69 W-30 cars, used them on the 68 H/O, but went to black on the 69 H/O, then back to red for the 70 W-30. Maybe it they just didn't like the look of the red inners with a white/gold paint scheme?
