67 twin turbo dart

I've never tuned a forced induction car, so I could be talking out my ***. If it were me seeing constant lean conditions, I'd add a ton of fuel to the top of the table above 4500 and back timing to a conservative level, then go for a rip. Data log the run of course, then go back and adjust accordingly. I'd rather it be fat and safe than lean and worry.
Oh I have been, like adding 4.0 each time, timing is good I think and safe. Found the top of my fuel pressure regulator leaking when I got home so I'm wondering if the Mallory isn't up to handling two AEM 400 lph fuel pumps and the Mallory handles max 200gph which with both pumps above 3500rpm its 210 gph.