Is this an AX car or a "race car" or a DE car? Are there class rules to worry about? Street legal?
If a 1.8, it sounds like a '74. "Fresh" 2.0 is vague... Carbed and cam? Euro pistons? just factory rebuild?
Can you ditch the windshield/pillars?
Lexan?
Rear bumper
I bet Fake Fuchs are heavier than factory fuchs..
Cages are heavy - ditch that if not needed
Chalon Kit is heavy, even if fiberglass. I bet regular GT flares would have been lighter, but you work with what you are dealt with.
Wide wheels with 100hp never works well. Lots of drag and weight to overcome
I see some pretty serious builds in this thread. If your car is the one in your avatar, well then, going to those extremes might not be reasonable)
The lightest I could get my stock , early 70 1.7 (ie, no spare, jack, toolkits, floormats but otherwise "stock" was 1990lbs with a full tank of gas)
And then the old adage "seat time, seat time, seat time"... seriously it helps.