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You need a front sump 13b oil pan and a 12a front cover 2 mount the motor like a 12a.I have a corolla and the engine bay is a littler bigger than a starlet and there is no room at all 2 built any type of cross member 2 use the stock rew mounts.On the starlet the cross member has 2 be modified and the original engine mount brackets removed and then you have the steering components on the way 2.You also a need a turbo 2 trans with the shifter moved forward 2 make enough room 2 push the motor back and down low cause if not the shifter will end up on the rear seats.
The other way is 2 have the firewall modified and have a midplate install and do it that way.
You're going to need to weld on some heavy reinforced bungs to mimic the GSL-SE front cover . Make sure to jig your front cover on an old scrap iron, bolt it down well, so you don't warp it.