Hydraulic lifters would be STOCK from the factory. On the 84 engine.
There would be 0 backlash on a hydraulic cam. If you asking about piston to valve clearance, you would want about .100" , but shouldn't need to worry about it if it's stock.
If it is still factory stock, then your question is yes.
If you're going stock lifters, they're hydraulic and you don't mess with them. If you've replaced with solids (which is a really good idea), you'll need to get that information from the people who manufactured the lifters/cam.
Stock 350's have hydraulic lifters, so feeler gauges aren't needed. Get yourself a Chilton's manual or similar and read up on the valve adjustment process.
If you have a 2001 or newer engine, it comes with roller lifters and roller rockers from the factory.
Yes, you will need an E-curve cam to have the correct profile for EFI. Edelbrock, Comp Cams and other aftermarket manufactures have cams for such swaps, or you can find a cam from an 88-newer 5.0L/302 that has EFI from the factory, in doing this you will also need to change the lifters in your engine as stock 88-up engines feature hydraulic roller lifters, any flat tappet lifters will wipe these cams so its best to do the swap.
A 2002 Chevy duramax has 300 horsepower stock
As i believe, from experience of owning one, 1984 is when the hydraulic clutch came into place. You shouldn't need to bleed the clutch on an 83' S10. Not unless its not the stock transmission.
gm
stock brand of tires for the 2000 chevy silverado 4x4 ext cab
Most likely the "knock" is more of a "tap". Especially if it's a roller cam motor. GM stock hydraulic roller lifters are notorious for cold engine noise. Other than that, in earlier motors, GM had an issude with piston slap (www.gmpistonslap.com)
4"