[screwballl]

after going to the Edelbrock 600cfm (part #1400 available from www.summitracing.com ) i will never go back to a Q-jet. yes my truck would start first time everytime... unless the engine was warm, then it would take 10 minutes to never to start. Thats why i needed to replace it, as soon as the engine was warm, if i shut it off, came back to try to start it 30 mins or 4 hours later, 95% of the time it would NOT start.
I got this Edelbrock with adapterplate for Q-jet intake, i have close to twice the power, speed and response that i did before with the Qjet. It is quick of the start and quick to respond in traffic. I have Michelin 31x10.50 XTC tires (made for off road) and it spins them on dry pavement. Never did that before with old carb, had to be wet before those tires spun.
My personal suggestion based on what 95% of what everyone else has said, definately go with at least the Edelbrock carb. If you want part numbers for summitracing.com let me know and i will give them to you. It cost me about $310 for carb, adapter plate and chrome aircleaner/filter. I did it myself and have NEVER done any engine repair myself before and it was easy enough for me. To have someone do it locally, it would have been $600 for the same parts plus labor.