I believe that the new sensor will come with a gasket, a copper one. It should work just fine but a bit of RTV (sold by permatex "Ultra Grey" is the best stuff). There is a drain plug on the on the block near the back. Drain a bit from there and you should be fine.
The only other bit of advice I have is that I had a similar problem. It ended up with a total car rebuild. I also found that it was easier to pull the intake manifold, but if you have small fingers and tons of patience you should be fine.
Andrew
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