No power!

[cheezsnake]

That's odd that the bigger jets improved things. I would have guessed that they should have made it worse. Usually, when the engine bogs down intially on hard acceleration, it's because you're getting too much fuel. It takes the engine a little bit until the RPMs pick up before it can use the fuel. If the engine loses power at high RPMs, you might be getting too little fuel. From my experience, that initial stall happens when the secondaries first open. I suppose it could be the accelerator pump shooting too much gas in. I can't give you a recommendation on jet size...it's been too long since I messed with those on that carb, but with a 302 I wouldn't get too radical. A common mistake a lot of guys make is going too big with the CFMs when the engine can't use it anyway. A 600 is probably about right for that engine. I currently have a 289 with a 570CFM Holley.