The stock gasket will leak from the get-go. The Felpro gasket's (three pieces - 2 exhaust, 1 intake) from will set you back $30 and will last about a week. They are also a real pain to put on unless you have four hands or you have replaced all the bolts with studs. I use one from PAW. TDP-4268, about $7. One piece, looks cheap, but seals and lasts. I used studs for all the manifold bolts. The locating pins on both ends are threaded in. Put studs there too.
