I'll second the recommendation for remflex. I had the same problem with my 340 driver. The remflex gasket was an easy fix. Just be careful not to over tighten (DAMHIK).

http://catalog.remflex.com/

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If it is a flat exhaust flange it had a gasket.I don't get into debates much but I'll argue with you till the sun sets on this one.The second car I ever took the exhaust pipes off was a 54 Dodge Royal Pace Car convert with a 241 Hemi.It had gaskets fifty four years ago and so did the 50 Plymouth flathead six which was before that.And,if you want to see a parts page as above from a 1957 parts book showing gaskets,let me know.

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I agree!!!!!!!!

Thanks for all the great info ,I know for sure theres 3/8 bolts in it and Well make sure the mating surfaces are flush,

I had the same problem on my 77 bigblock truck. Kept burning the gaskets out. It was way to lean. Swapped out the carb for a fatter one and no more burned gaskets.

One thing you can try to help out, once youve got it bolted up, take a torch and heat the pipe near the manifold. There is usually a bend hear the flange, try and heat at that bend. (assuming you have acess to a torch)

If there is some sort of stress in the pipe, the heating will take the stress out. youll actually see small parts of the pipe metal flake off as the pipe "un-stressess" Many times while working at a Car-X we would heat certain new pipes to relieve stress. Aftermarket pipes dont always fit correctly. Some would be stressed so much, they would crack off in a few thousand miles.

I didnt see if you posted which side was blowing out, but I will guess its the drivers side.