[marxjunk]

ive owned 2 real 69 Zs..both where 3.73 , neither had posi's or tachs...or cowl induction..all optional equip...and both where untouched original..

i have 4 friends with real z's..all had 3.73 non-posi...2 daytona yellow..2 hugger orange

these where all way back in the mid 80s...so..posi is optional and 3.73 is mandatory...more bread and butter z's out there than cool loaded up ones then..now..it seems all of them are loaded up...maybe options saved them..i duno..

cant comment on l-78s...never owned one....but knowing chevrolet...posi was optional in them too..but the gearing was mandatory..

just my experiences and opinions