440 tunnel ram

I think the 660s are way more suited to a high performance build/race car. I have a set for my new build and they dont seem to friendly for street use. They are all 8 at once. Im currently running twin 4160 450CFM non vacuum on my high compression 360. (Non progressive)

The 660s are for my 6-71 build so i haven't tested them yet.

If youyou comfortable tuning them i would certainly try them out but be aware that they are not designed for part throttle or MPG. They are strictly for wide open applications, ie boats and race cars.

Are they better for your application, i cant say. I will be running them on the street but im aware of the compromise that they require.

I say try em out!

If you dont like them im sure you could sell the 660s, they are still worth a lot of money.