set a target, and there is a g54 proven recipee to follow
TBI proven good to ~400, but the further u push it, uneven fuel distribution comes to play. Many crack pistons as they found out
Mod a tbi or carb intake, with an injector at each runner, and that 'fixes' the fuel distribution somewhat
Magna hit 570hp & 550 ft-lbs street car. Not enough power?
If building a higher rpm setup, go for one of the short runner intakes. Proper cam/springs mandatory

Can clearly see the "cannon" intake on the red car 721hp dyno(still a solid 556 ft-lbs tq). He ran a schnieder cam
He moded the stock exhaust manifold to fit that big az turbo, but built a header after the dyno.
He said spoolup improved dramatically and car should hit ~850hp, with no other changes, same setup. The 54 can put it down