No, no restriction of any kind is needed or desirable. That is important enough that even a T in the line can cause hydroboost trouble due to the flow interruption/restriction at that junction.

Hydroboost only needs and uses pressure when you press the brake pedal. Otherwise fluid flows in and out uninterrupted, and then on to the PS gear box where it also flows straight through unless turning the wheel.
So without a PS gear box the "high pressure" line exiting the booster should go unrestricted back to the reservoir.
Then as is the usual practice for a hydrobooster its return line goes absolutely unrestricted back to the reservoir, NOT a T with anything else.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-