Your starter is parallel to your driveline. Therefore the angle of the starter housing is the same angle as your crankshaft and the output shaft of your transmission.

You can get an angle finder for less than $20 at Home Depot. To see pictures of its use go to my \'54 GMC web page and click on "transmission".

On Classic Truck Shop.com there's an excellent article titled Driveline Geometry 101 .

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.