So I've built a L92 out of a yukon denali. It came to me as a core, so I have no harness or ECM yet. Its going in to a 71 C10. The only mods to the engine is the ASA camshaft & remove VVT. The trans is T56 magnum. So is the E38 the ECM I should shoot for? or should I get the E67? Is there an option to run the manual transmission with the E67? Is one going to be easier to tune than the other?