360 LA installing Promaxx Aluminum heads

Just got back from picking up a new fuel pump for the Fairlane at Summit. Got the heap out on the highway and had some lean stumbles cruising at near no throttle situations.. basically whenever I saw a 15 appear on the wideband. Had this last week and I thought fattening the curb idle a hair fixed it... nyet. I'll pop the .058-.050 back in this afternoon when it cools off. That .002 rod actually fixes the lean situation but the engine is less "smooth" on the highway, but still runs fine minus the lean surge. Don't think I'll be able to get much closer than that. We'll see.