There is no V8 bell housing with the fulcrum. The 55 V8 truck used a completely different configuration as Bill mentioned previously. The V-8 design was incorporated for both in 56.
The V8 side cover has a long shaft to the rear (1-R) and a short shaft to the front (2-3). Both levers point down and slightly forward. There is a completely different 2-3 shift rod that is one piece. The shifter box on the column is also different as it has a dog leg on the 1-R lever to clear the left exhaust manifold. The 6 cyl shifter box may possibly be used.
I have some of these parts as I have rebuilt a number of these transmissions and have a variety of side covers. Send me a PM and see what we can come up with.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine