Take the bellhousing, spare parts and future options are always good things.

Personally I would go for a proper mechanical linkage and skip the hydraulic one, mechanical gives less trouble and is simpler most of the time.
So you probably want a normal left side fork bellhousing.

Grigg

•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-