Mk2's are a tad heavy compared to Astra GTE's, Pug 205's, etc.
To be honest and i hate to say it, Mk1 Gti would be best bet for hill climb or sprint.
Even if you stripped the Mk2 out, it would struggle in standard form against stripped out Astra GTE's i think, my old GTE was flippin rapid compared to my Golf! 1.9 Pugs are also rapid due to light weight tin boxes.

Build a twin-engined Gti, one 16v lump in back (powering rear wheels) and another 16v in front (powering front wheels)?!
Or even better, twin engined G60?!
