Donnie,
It's funny you ask this question. I just last month was at a company doing exactly what you are asking (Alpha 310 flux with infrared heating). They were successful, but they had 2 important things going for them. 1) A spray fluxer that was able to give a very thin coverage of flux. 2) The preheat was fairly long - I think it was 6 feet. This enabled them to get the board dry before hitting the solder pot (very important to eliminate solder balls).
I would also make a suggestion to consider an alternative Alpha VOC free flux. Alpha has a number of them, and from my experience at various companies, the NR310 may not be their best one, especially when it comes to top side solder.
Feel free to give me a call with any questions (914-795-2020).
Good Luck,
Steve Harshbarger Sono-Tek Corp. Harsh@Sono-Tek.com
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