Dang, I see negator has beat me to the punch with his (?) mention of Marathon bars (aka CurlyWurlys I guess now, but I never heard of those until I searched for Marathons), but yeah, Marathons. Total molar-extractors! Chewy and delicious. Hard to believe Mars opted to stop producing them! Here's some funny info on Marathons:
http://victorychristian.net/blog/2007/11/10/whatever-happened-to-marathon-bars/
(No, I'm not a frequenter of this or any similar blog, this was just the first, best link I found about them) They sound like they could be a GREAT porn prop - cowboys, rulers, and challenges to gobble it down as quick as you can:
"Commercials showed Marathon John (Patrick Wayne) riding into a scene. A villain would announce himself as Quick Carl and state something like, “. . . I do everything fast.” Marathon John would toss him a
monstrous Marathon bar and
challenge Carl to eat it fast.
The bright red package,
complete with a ruler on the back, made it stand out in the candy isle [sic] and at the check out during the 70’s."
(If only there WAS a magical candy "isle"!)
Anyway....I was also into Smarties, and good call by Will E on the Chunky bars (didn't they used to make one that only had nuts, without the damn raisins??).