My earlier Speed Champions scaled Ferrari 308 was inspired by a Matchbox from my childhood too like my '57 Chevy :) However, earlier I have built the berlinetta version in full red color scheme. Now here is the Matchbox version with gray bottom part and a bit modified rear grill. I haven't made instructions for this version yet, but the instructions of the 308 GTB Quattrovalvole and Magnum's version are available on Rebrickable and on Mocsmarket on the above links.
Ferrari 308 GTB - Matchbox edition 01 by László Torma, on Flickr
Ferrari 308 GTB - Matchbox edition 02 by László Torma, on Flickr