That 2.5 fully dressed with turbos is around 400 lbs. A fully dressed 6.0 LS is around 460 lbs. So not much weight difference. Take the ls engine and do a cam swap add some 1.6 or 1.7 rockers with some 1 3/4 headers and the built 2.5 is no match.
Seems Pat Musi has got a handle on that new car because Lizzy is fast! Ryan is a great competitor and he's tough to beat. Watching this past week's show made me realize I'll probably never like Justin Swanstrom.
I'd finish it as a backyard brawler street racer. Put it in primer and leave it at that. You can build another chevelle the way you want but you have put some really nice work into that car it should be finished.
One thing that has affected me is trying to decide what to build next. I have so many choices that it's tough it was much easier when I didn't have as much stuff. I get started on one then an ideal pops into my head and I start another.