Swap the reservoir for a more useful one or a remote and very likely have to add the "high pressure" return fitting.

I don't see that the pump and fluid will be doing much work without an actual PS gear box so heat should not be an issue.
If you did want a cooler or filter or any other possible restriction it would go on the "high pressure" return.
The return hose from thehydrbooster only returns spoon fulls of fluid after pressing the brake.

•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-