The trans will bolt up, but you will need the correct bellhosing and shift linkage. The 6 cylinder bellhousing will not bolt up to the V8 engine. The Chevy V8 bellhousing shouldn't be hard to find, same one was used up to the late '60s. A good sorce for one is to look for Low Cab Forward (snubnose) trucks at the salvage yards. '55-'59 those trucks came with a V8 as standard equipment.
The rod for the linkage could be made easily if you can't find a correct V8 one or one from a '56-'59.
You will also need to come up with front engine mounts, either the factory style front mounts, or the universal style side mounts.
The swap can be done, you just need to have all the correct parts on hand to do it.
