Ram horn exhaust, edelbrock manifold - Couple questions for 82 gmc 4x4 3/4 ton

[Joemt]

I would like to put ram horn exhaust on the 350 I'm going to drop in the truck. Motor has an rv cam and I bought a 600 Edelbrock carb.

1. I'm not sure which ram horn to use...2" or 2.5"  straight or angled back (I think the angle is for non 4x4..am I right?)  What years fit?

2. I have A/c in this truck......do I want the 2101 or the 2701?  2101 states for all brackets....does that mean I can't use the 2701?

Thank you

[Burkhalter]

2.5" will give you more airflow with less resistance. But the 2" should work just fine. For angled or straight, how are the stock headers set up? Don't quote me on this, but I think the angled headers were for the cars like the nova or impala. But I think you would be able to do either. Just depends on how you plumb the pipes.