Here are a few answers:

Oiling system:
The oiling system is not camshaft priority. Oil holes are drilled from each main brg bore to the corresponding cam journal. They intersect the main oil feed that runs thru the block, from front to back in between the cam & crank bores. Oil coming from the filter to the main oil feed, then feeds oil down to the mains and up to the cam. Intersecting off the #2 & #4 cam feed lines are the oil feeds to the cylinder heads & lifters.

Rockers:
I have the T & D's. They're very nice and are working well so far.

Lifters:
No one makes a solid roller lifter at the moment. HHP is working on some but they are still not available. I bugged them for awhile and just got a set of Hilift Johnson lifters and shimmed them solid with ground hardened washers. They are working good so far.

Heads:
I run the Thiteks with 2.165/1.65 valves. I use Pac Doulbles.

Stock Valve Covers:
I have the stock cast 6.1 VC's and they will not fit with the T & D's. Not enuff room under the covers. Had to go to cast Indy's.

Stock Cam tunnel:
I have the dims, just not with me at the moment. Not sure it's worth going to needle roller.

RItter Intake: Works well so far.

Max Bore Size will depend on sonic check of your block.