Doesnt hestitate but seems sluggish till about 3k, heard it ping on 93 octane uphill under full throttle at top of 2nd gear on hot summer day, retarded 2 degrees(32 ALL IN) doesnt do that anymore. Edelbrock 600cfm, idles @ 650-700 in d and 750-800 in P or N.
Measure and plot out the timing curve. Once you do that, then what to do is pretty straightforward.
The sluggish accel to 3000 could be timing related too.
Dynos are great but they won't be a big help on the launch. Get it into the safe zone, which its not right now. No point in repeating a high rpm, high load test at this point.
Winter fuel. It has lower Reid Vapor Pressure (RVP) and sucks when we get warm days early in the year.
You can try to reduce the problem but especially idling at low or no speed not much fuel moving through the lines or the bowls so it picks up heat. There are thin insulating spacer gaskets, and phenonlic as well as wood spacers starting around 1/2" thick. Just have to watch hood clearance when adding spacers with a dual plane.
Other things to do that may help is use factory fuel filter location and steel or stainless lines as much as possible. I've insulated some of mine. Also on my current engine there is a valley pan to reduce hot oil splashing on the bottom of the intake - at least thats the concept.