Hmmm...grails. About 15 years ago, I started a grail list of AMT, MPC, and Johan annuals from '58 to about '80. I've found many that are on my list that were semi-hard to find ('67 Galaxie ht & conv, '66 Buick Gran Sport, '59-70 Bonnevilles, '59-72 Impalas and '73-76 Caprices, late 60s-early '70s MPC Mopars, etc).
But I still have many on my to-find list--early '60s AMT Mopars (Imperials, Valiants, etc), various '60s compacts (Chevy IIs, Corvairs, Falcons), early '70s MPC Firebirds and Camaros to name a few. Also still looking for some Italeri Ferraris that I missed out on 20 years ago..