Check out this intake from Goertz1 Pro. Made right here in the USA.
Fully Cad designed and developed this intake manifold is built to deliver huge airflow to your engine.
Developed primarily for the needs of forced induction however this manifold should work quite nicely with a large cam and higher than stock rpms or larger cubic inch displacement.
Can be setup dual fuel rail for high power demands!
Use either G1Pro -10 GM Fuel Rail or Holley EFI Fuel Rail PART# 534-224