I think i have close to what you are looking for. I am running a G5X3, full bolt on's,unported LS6 heads"for now", Vig3600.

Made 403/405 @ the wheels.. Car is a DD... and it is a blast to drive everyday!! I too am running 323's... once i do ported heads,FAST, i'll upgrade to 373's and drive th car weekends, etc.. But for now, it's very fun to drive.

Go with the Vig3600...JMO...

 

3600...