Either one should work fine.

I've got the only good working 750cfm Edelbrock AFB on Moparts. No problems with mine and the Duster runs very well with it.

1970 FE5 Duster 360/904/3.91's SOLD 1973 TB3 SpaceDuster 340/4spd/4.10's SOLD Moparless for now but when the opportunity is right I'll have another one.