Thanks for the info, I had most of the things you mention, 4 into 1 extractors (swapped them for Genie Tri Ys because the Hurricane ones dragged on the ground) Genies give better torque but less top end.
Have Camtech 247 duration GAS camshaft. Had Cain single plain manifold (sold it and put original back on) Have 302 heads and flat top pistons. Had the dizzy regraphed for gas. I am now running a 600 Holley and it goes much, much better even with the gas cam. I have a mixer I can thow on top, but I want to get an Elko high flow set up (www.elko.com.au
), do you know about them, are they any good??? Its good to see someone is interested in gas as everyone in my car club looks down on it and tells me to rip it out, but that's what your doing as well isn't it??