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dual exhaust

With the size of your engine, you will be better off going with a 2 inch exhaust, the larger size will cause you to lose bottom end power. You should also run an H or X pipe in the exhaust system as well, to improve the scavenging, and this will also improve bottom end power without hurting your top end.

even with a 350, unless you really warm up that engine, 2 inch exhaust wont hurt you any.

I put 2.5 inch dual exhaust with an H pipe, on a 302 in a 70 Ranchero several years ago, and it killed my bottom end. what I did to correct that situation was to get another set of header extention cones, and put them inside the ones that were on my exhaust system. The cone I installed necked the exhaust down from the 3 inch collector to 2 inch. With this inside the 2.5 exhaust, I got my bottom end back.
An added benefit to the cone inside the cone, was that it made an anti reversion outlet, so exhaust pulses couldnt rebound back up to the exhaust ports.

You will notice that this tech is being used with a lot of headers now, only on the individual runners.
 
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