Need some advice on diagnosing my engine problem. I run a 350 small block with an Edelbrock Performer intake and matched Edelbrock 4-barrel carb, headers, and a Mallory Unilite distributor and coil (TH350 tranny). My problem is this: The engine runs fine at normal loads and speed and at idle. However, when the hammer is dropped it stumbles a bit. Sounds like a fuel delivery problem. I do run a stock fuel pump, and have already replaced it once (filters too). This problem increased when I went to Big Bear last weekend, so I thought that I might be running a bit rich since the symptoms increased at a higher altitude. Anyways, looking for advice. Do I check the timing, adjust the fuel/air mix, or look into a high flow fuel pump? Any thoughts appreciated.