Zarad

Hey everyone. Got a 1978 subaru utility,brat,brumby it's been rolled its not road legal but I want to make it an ultimate off road madmax looking beast has roll bar full bull bar. Motor has been sized and unsure what will be the easiest moto swap to give me as much power as I can get and allso keeping it 4x4.... any help greatly appreciated I tryd uploading photos but file size to big. Would like to raise suspension higher and chuck bigger feet on her