[SFfiredog]

A $350.00 safety bellhousing is much more cost effective than a $1000.00 to $1500.00 trick multi-disc clutch.
The main advantage to the muti-disc is their smaller diameter which allows the engine and trans to be located lower in the chassis. They are hell to drive on the street as well.
Also, the trans in your photo of Olthoff's car is a Tremec 3550 5 speed.
--Mike