Teach me on the Demon sizzler stripe

the sizzler package was supposed to be the cousin to the duster twister. I am pretty there were no sizzler 340 made because the point of the sizzler and twister was to look like muscle but be economical and fuel efficient. They had either slant sixes or 318s.

then in 72 the same hood treatment appeared but often accompanied with the dual snorkel scoop depending on engine option.