[kipps]

An nv4500 is really the only reasonable bolt-in five speed option. There's several routes you can go.

Use a 92-95 nv4500 with your existing bellhousing. You'll need to drill and tap the face of the transmission to accept bolts, and the bolts will be installed from inside the bellhousing. The clutch linkage will remain exactly the same as it currently is.

Use a 92-95 nv4500 with its stock bellhousing. You'll need to use the clutch pedal and clutch master cylinder from a 85-87 truck. This will connect to an external slave down low on the passenger side of the 92-95 nv4500 bellhousing.

Use a 96-07 nv4500 with its stock bellhousing and internal slave. This will require the clutch pedal and master cylinder conversion as well.

Use any nv4500 with an Advance Adapters aftermarket bellhousing. These should allow your stock mechanical linkage. Contact Advance Adapters for specific fitment details.

A nv3500 will fit very similarly, but it's definitely not recommended for big block torque outputs.