After doing some reading on ColoradoK5.com, I have come to the conclusion that the headers from my Chevelle would fit the Blazer just fine! I almost took them to the scrap yard with a load of other scrap metal a few weeks ago and was glad that I had not. They have light surface rust on them and can be cleaned up for the purposes of my Blazer, but I was going to be getting either stainless steel, or ceramic coated headers for the Chevelle. When I was down to my dad’s house a few days ago, I grabbed the set of headers.
I took the Blazer for a spin down to the tire/exhaust shop at the end of the road to have them give me an idea of how much it would cost to have an exhaust system installed. They use heavy pipe for their exhaust systems and bend it up right there, but they are quite expensive.
On that drive, I still had a pronounced bog at initial throttle opening. WOT was good and it revved freely with greater throttle. I have found several references for tuning the Rochester Quadrajet carb and all signs point to a malfunctioning accelerator pump. I will be pulling the carb again soon and will likely be fully rebuilding it.
I definitely need to get the exhaust fixed up and then move on to tuning things up. It is difficult to hear what is actually going on with the motor when the exhaust is leaking out of several places!
Several local and online retailers have a performance dual exhaust system that would bolt up to the headers so I will likely be going with that arrangement.