So much hate for Hellcats... I love it!
Hail to the King, baby!
I've been telling the guys on the Hellcat forums that they are the worst cars to make into bespoke drag cars. Most are too heavily optioned and too complicated. They do lots of things well and are not technically the most proficient at anything. It is a GT car, not a drag car as so many folks con themselves into believing. I've also told them that a fast car driven poorly embarrasses us all. I don't think they like me very much... LOL.
OP has finally come around to the realization the only way a G-body can top a HC is in a straight line. But, at 1000lbs lighter is that really much of a win? Its not.
There are lots of ways to run low-9s in a G-body, and lots of things that you can leave out that a modern muscle car cannot (and cannot remove without voiding the warranty) to get the results you want. However, to get a G-body to be a 9 or 10 second fully comparable GT car like the HC... well that is going to take almost twice the cost of the HC... and a decade to generate the resources, parts, and to construct it.
I showed you a perfect starting point car that is well built for fair money which will easily achieve your goals... and you can tweak it over time as money allows or desire dictates.
Also, we'll see how badly the HC handles in autocross this summer.