What I have is a 57 Chevy with a 58x motor, 4l60 and twin turbos.

It was running with a manual trans and an 06 C6 ecm and 2bar OS.

Also have a TBSS ecm/tcm/harness but no custom OS.

What's my best option for running this setup with a custom OS as far as wiring harness and ecm/tcm. Thanks.