The seats in my 89 do the exact same thing. the driver side goes back farther than the passenger side by about an inch. (if it's more than an inch, there is something wrong).
BTW i'm 6'4 and so is my bud, and he sits there (and doesnt complain, i know it's not huge tho)....

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim