Elgin catalog page 25
http://www.elginind.com/wp-content/uploads/2018/12/Elgin-2018-ProStock-Catalog.pdf
216-216 =272 =E-1789-P
204 -214 = 277 288 = E-937-P
218-218 = 276-288 - E 1223P
lots of other choices but only one for broke students with a stock setup is the top one
big jump from there to the 204-214
you can figure lobe centers from the lobe centerlines
add them together and divide by 2
you can find the 340 cam on page 2 e-578s
209-229 279-289 E578-s
there is also an early four barrel cam there pn 4227879
