I have a 1968 Johnson 20 ,the cowl has more curved sides and the top is slightly bowed up than the one you posted. that looks like the cowl on MY 1981 and 84 Johnson and Evinrude 25’s . I was going to make the 68 cowl into a camp stool like was shown on dockside chat awhile back.. would you like to see a photo of it ? PM me your email and i’ll send you a photo, i’m willing to sell it
"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson