Never done this before (no header gasket)

I've never had any luck with paper gaskets of any kind. Alternatively, I've never had any leaks with Percy's or Remflex gaskets, so I stick with those. Lately, it's been strictly Remflex on all my junk. A tad pricey, but they're worth it in my opinion.
my thoughts exactly, I have a set here waiting. Thank you once again mowers