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Not really up on my 400 info but why not just get the Vortec baseplate for the Holley StealthRam setup and run that? Fairly inexpensive and it will flow enough to support the cubes.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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