[Advanced Design]

Ebernst, looks like a fun build.

For exhaust manifolds a couple of us using the LS went with Hooker exhaust manifolds from Holley. They fit well.
And for a fuel tank there are a couple builds going now that are using the 67/68 Camaro fuel injection tank from tanks placed behind the rear axle.
For a pan I am using F body or one of the Holley pans.
Engine mounts, I made my own then moved the engine back more and used Dirty Dingo slider mounts.