These guys are correct, but I have a very simple solution for you...
1. Morty426 is correct about 4 air-grabber air cleaners. The 383 4bbl. and 440 4bbl. have the same lid, but the 383's base is about 1" taller in the area where the base slides on the top of the carburetor. Setting on the ground, the 383 bases will stand up off the ground & 440 bases will set flat.
2. I don't believe the shorter 383 will hurt your too much (if at all). It might actually HELP you since you will have about 1" extra hood clearance to play with....just enough for some nitrous plates, some vapor lock resistant carb spacers, or just regular carb spacers. GO FOR IT
3. And to answer your specific question, the 4 bbl. air cleaner lids are round in 1970 & the six pack air cleaners are big/oval. The 69 4-barrel air cleaner will fit in a 70 hood, but not the 69 six pack air cleaner, fyi.
Edited by PurpleBeeper (02/11/18 06:42 PM)
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"