The only whine I've seen in these engines is an improperly installed timing chain tensioner. You can't just screw it out and then back in. The recent timing cover job sounds like a smoking gun.

You need to immediately pull the tensioner out and reset it before running the engine any further.

With the entire tensioner removed you remove its cap and push the plunger all the way out. Notice the circlip on the plunger. You want to insert the plunger back into the body until the circlip engages the first notch in the tensioner body. You then reinstall the tensioner body in the timing cover and torque it. You can now push the plunger in as far as it will go taking the slack out of the chain. Don't worry if there is a little slack in the chain still, oil pressure will make up the difference. Install the spring and cap last. Its tricky. I use an allen bit on a ratchet with a shortie ratchet wrench on the bit. You only use the ratchet to hold the cap in position and the ratchet wrench to turn it. Do pay attention to the soft aluminum seals, its easy to have them slip out of position and ruin them before even realizing it.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff