I'll take Doc Browns DMC and go into the future a little ways, get the winning Lotto numbers for the next several big ones, come back to present time and win several $300mil jack pots and buy LOTS of cars. Wouldn't want to go into history and risk messing something up, but changing the future wouldn't be so bad...
That aside, 70 HEMI 4spd Super Bee hard top in B5 with no vinyl top, B7 bench seat interior, white C-stripe, Go-Wing, Super Track Pack, 15" body colored steel wheels, hood pins, tinted glass, wheel lip mouldings, Duel body colored sports mirrors, Rear sway bar, AM/FM radio w/ 8 track and microphone, exhaust turn down tips. Then sitting next to it would be a 70 HEMI 4spd Road Runner hard top in EV2 with white vinyl, dust trail, black hood stripe, gold deck lid stripe, hood pins, body colored sports mirrors, black delux bench seat interior, AM/FM 8track, 15x7 rallys, Go-Wing, Super Track Pack, lighted hood, exhaust tips, Bumper Guards, Rear Sway Bar. I think those two cars would be so bonerific