Having restored pumps for over twenty years, the visible pumps are the most time and labor intensive. Since you are new to this, just be warned, most basket cases will be missing something needed to assemble.....Vital parts. Being unaccustomed to this stuff might cause you a lot of undue stress? I have adopted the policy of "never" buying basket cases. No matter how many times the seller says..." It's all there". Paul www.severngaspumps.com