[83GMCK2500]

I dug around a little and I swear I've read most of DirtyLarry's 8.1 posts, have yet to find the answers I am seeking.

My DD, Vortec 7400 powered, love it, am looking into some upgrades for it. I get that heads/intake/block all have different bolt hole locations, bolt patterns, etc, nothing interchangeable there with other engines(excluding classic bellhousing pattern). One of the upgrades I'm researching is coil-over-plug ignition, another is headers...they are slim pickings for GMT-400 7.4 powered trucks.

- Will 8.1 exhaust manifolds/aftermarket headers bolt to a Gen VI? If so, recommended brand/model, or is there a nice high flowing factory manifold?
- Do 8.1 valve covers bolt to Gen VI heads?
- Does the 8.1 timing cover bolt to my Gen VI?