Edelbrock LD4B

View attachment 1715125457 The engine came out of a 66 Barracuda. The owner is a professional engine builder with a lot of racing experience. He's the one that recommended the LD4B so I'm thinking it should fit. Currently it's running an Edelbrock 500cfm carb on a cast iron intake.
I have managed to get an LD4B intake. Right now I'm using a 500 cfm Edelbrock. Do you think that's enough carb? Seems like a lot of people are using 600's. Haven't been able to try any engine work as It's getting some paint.

20180217_071723.jpg