Editing How to check driveline angle

On a drive line for a very short drive shaft as in 11" for a t-bucket could you use a level if you didn't have a angle finder or a protractor? (example, if pinion shaft were to read 1/16"of bubble up and transmission shaft 1/16' of bubble down could it be considered close enough to 0 degrees to call it good?  or does the extreme shortness of the drive shaft require considerably closer measurements?

Good question but since a proper magnetic base protractor is available for very little money why would someone wish to do this..?? The proper way to set the angles is to measure the angle of the rear end yoke and the angle of the transmission output shaft using the protractor to establish the base angle. Once this is known then the drive line angles can be adjusted by shimming the transmission mount or using tapered shims if you have leaf springs or adjusting the links if one is running a 4bar with adjustable links. Most builders will measure the angles during the mock-up stage in order to get the all the mounts fabricated to the proper dimension. The better builders will leave themselves a means to adjust things during final assembly in order to tune the chassis and correct any mis-measurements..