Square bore or spread bore?

[tomt966]

I think I need a dual plane instead of my single plane intake. I have a 340, .030 over, comp 268H cam, and Holley Avenger 770 carb. 904 trans and 323 rear. Which should I buy for good street performance? Spread bore or square bore? I'm thinking of an Eddie. Thanx

 

[ramcharger]

Since you have a square bore carb, get a square bore manifold.

 

[fishy68]

The Air Gap is nearly impossible to beat on performance and it's a square bore so it'll match your carb.

 

[tomt966]

OK, Air Gap it is...... thanks. Now I can move on to my next problem in another forum. &*$$@ cooling!!