viva las vegas

I'm shortly to retire. I decided to get into a mild classist/ hotrod so bought a vauxhall viva 2 dr 1975. It had more rust than I thought. This has been replaced by all steel panels made and fitted by Cedric at auto restore mangatapere whangarei. I then painted my car myself. It has widened trims and has been lowered. it has a coby exhaust. It has a mild cam and goes well for a 1300. I have had it up to 140 km h . Would like to put a 2l Toyota auto into it to make it more responsive.