How to upgrade a LO5 TBI engine?

[RITTER]

I have honestly never heard of anybody doing that. I am sure a good carb intake would flow better than a TBI intake :idea:

 

[dream on mcss]

Well, if you werent set on the stock heads id tell you to get a set of 350 vortecs. They flow much better than the heads you have now, but since your set on the heads, you could just try using a thinner head gasket to up the compression and maybe a port polish for better flow. You could also get an msd coil for a more powerful spark. Good luck on the build!