The one from Mancini Item# MRETCS-2 is probably the correct one,they just have the wrong picture on the web. They are showing 3 different part #'s
so ........... I would say
Item# MRETCS-1 is 727 Big Block
Item# MRETCS-2 is 727 Small Block
Item# MRETCS-3 is 904 Small Block
Year One is cheaper, but if you are ordering a bunch of stuff from Mancini (like filler tube and such)
then it would be about the same because of shipping.