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A sticking valve will make it backfire through the carb...

Thanks guys...

I once had a little piece of gasket in the fuel bowl that would get sucked into one of the jets at freeway speeds causing the same thing you are experiencing.

I'm new at posting on forums and have found some enjoyment doing so rather than deleting brain cells watching TV. I just recently created a new web site (with the help of a friend) and am feeling a little more computer literate also. I have been a Ford guy all my life, started a shop in 93...

It's possible you have a valve hanging/sticking in the guide. The valve guide clearances on new Edelbrock heads are always a bit tight and I hone them to size. Just another idea. The FIRST thing I would do is remove the valve cover and inspect things like many have suggested.