Re: LS3 vs 396 BBC
I have a 396 in my 68 Camaro & a LS3 in my 91 Firebird.
Although I would never swap out my solid roller 396, I am very impressed with the LS3.
The LS3 will respond to a better tune, as most factory tunes seem a little rich. Mine is currently at 13:1, which is much better than the 12.6:1 it originally had. I also shift it at 6700.
The LS3 is faster than it feels, with a smooth broad power curve, whereas the 396 hits really hard in a narrow rpm range & feels much faster.
Do you have any track times from before the swap?