The Intek has a decompressor (yes, a nasty one that causes tappet adjustment to be extremely sensitive or it doesn't work and many people burn out their starter motor before they figure out what is wrong) so the compression pressure should be something less than 100 psi, but I think more than 80 psi. Listen for leakage if you can.
I think getting a genuine Briggs gasket would be the best bet, just because even genuine ones frequently don't work, so an el cheapo would be adding insult to injury.
