Hi Mark, I ran a holley street avenger 670 for last summer to appease the race car owner. I sold that holly this weekend so I was going to re jet the primary on my quadrajet cause I wanted the rich it up a bit. I had one of my clients put my car on a sniff test when I had the Rochester on it and the readings was that it was running lean in the primary's. Plus when I hit the secondaries on the highway it felt like I dropped the car a gear and took off like a champ so that tells me the primary is too lean. When I took it apart I have 43k rods and 75 jets so there is no way that set up should be running lean. What do you think it could be. The holley was quicker on start from stop but the quadrajet kills the holley on the highway
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