Well..... on a '70, I've only found the stock intakes clear the hood. You can "get away with" about 1/2" taller if you don't mind your rubber sealing ring getting a little wrinkled. All the aftermarket intakes I've tried + any spacer of 1" or more on a stock intake & the hood won't close. I've actually had to notch my air grabber scoop so it will close with a stock intake & 1/2" spacers.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"