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Great info Gumby, much appreciated. The search is on for some Corvette manifolds!!I used 97-8 corvette manifolds. They are sheet metal instead of cast, so you can cut the right one, turn it 90 degrees to go under the oil pan and then use a wye to join the two together on the left side or run duals side by side. A wye designed to split a single pipe run backwards is an easy way to join them. Make sure you have clearance to the pan before welding and have room to get the HO2S in. You can use the stock bung, but it will point at the block after its turned.
H3 oil pan, also marketed as a hot rod pan, is cheap and easy. About $130 on summit with a gasket. You will need it to clear the driveshaft.
A Spectre cold air intake for a Silverado turned just right puts the air filter up in the right rear corner by the hood lovers. The box it comes with is easily modified to block off the engine and draw through the vents. I don't have a blower motor in that corner on my pre-heater 64. YMMV
Steering is just regular old Saginaw steering. I use a hydro boost on the 64 to clear the support ribs, but an aqualu won't have that issue.
I would highly suggest a Lokar shifter for the 4L80. Works great. Looks right.