500cfm Summit carb on 318

Dropped a 500 Summit carb on my mild 318 to try out. When I accelerate aggressively around 3200 -3300 rpm it seems to be starving a little. If I back off it's fine and can cruise down the road with no problems. Adjusted fuel pressure up a little from my Eddy. Not sure if changing secondary springs would help or not. Probably go back to my Eddy but I thought I would play around with this a little. Any thoughts, throw them out there, thanks