Hello and welcome to the
GCZ.
Ascona C... unlike most people say, it was actually an impressive car back then. I had the British version, the Cavalier Mk2. It was the 1987 CD 4-door Saloon (Sedan), Manual with the 2.0i 116 Bhp engine; very rare car, it was fairly quick and handled quite well. Fine. But it had a very NASTY habit of rusting as fast as it accelerated... I remember the car was only 3 years old and it was already looking pretty scabby.
I kept it for one year and the rust was so bad that it ruined what could have been a decent car. No wonder that of the 807.000 sold between 1981 to 1988, there are only 6.500 still in perfect working order on the roads of the UK, not to mention the security system was crap which made it the perfect car for joyriders.
But anyway...
The best thing about the Ascona C or Cavalier Mk2 is the parts interchangeability with other Opel (Vauxhall) cars. Yes, it is possible to fit the Calibra 2.0 16V engine, make sure it's the "Redtop" engine. It's more powerful (150 Bhp) and more reliable than the Ecotec (136 Bhp) from the late Calibras. I'm pretty sure it's also possible to fit a Calibra gearbox.
The 2.0 16V 150 Bhp with the gearbox of a Calibra or Vectra with he same engine should do just fine a light car as the Ascona C.