98/99 150/175 didn't have the pinned heads, had a air cooled computer, and old style injectors.
dfitechnoligies has pics of these parts so you know what you are looking for and what to run away from . . . I've found lots of folks advertising their 98 or 99 ficht as a 2000 w/low hours, so beware. I had a 99 150 ficht w/ the air cooled computer and swapped it for a 1981 Merc 225 (best decision I ever made).
http://www.dfitechnologies.com/products.html
I rigged a 2007 Etec 200 HO this winter . . . and it looks nearly identical to the 200 Fichts.