Oh I understand the 335 and small twins. Single turbos will always outperform twins (especially sequential turbos) for overall massive HP at peak. This is why all the late 90's supra TT owners convert their cars to a single garret BB monster turbo.
The 335 is designed for lighting response off the line with little to no lag. With a tune alone they are incredible and will run 12's. However with those small snails they are sitting ducks on the highway
You will be amazed by the power of the Ls3 at 422. No one needs that much power, until about month 3 when well it could use a little better pickup (Intake) and month 5 when ya know it could use a little better breathing and some top end (Headers/Cat Back) then 1 year well she seems to have lost some punch (SC) lololol