The car had a 1.8 silvertop as standard when i bought it.

To use it as a cheap track car this year, il just chuck a silvertop back in there.

I have an HO inlet, and will need another 4-2-1 exhaust manifold and induction kit ect. I have 130 bho 2.0 cams and ecu. With all this fitted, would there be much of a difference if i went for a 1.8 or 2.0???

While this is in the car, il build a fresh 2.0 in the garage, and how about a port / polish, bike carb kit with ignition ecu and biggest cams that will go without modifying the head?

Should that see around the 200bhp mark?