Mine was approx 120-130bkw It did go well but was very thirsty, flat out I would do 350km out of 83L,
Your mods price wise will depend on how much you are doing yourself. Im driving a carbie VK atm, when I built the engine it I putin a slightly mild cam, ported the head out & the inlet manifold & headers. Also a VK electronic dizzy. Goes marginally better than a normal carbie VK.
If your after cheap mods to a carbie VK, Electronic dizzy, rip the head off attack it with a diegrinder on inlet & exhaust ports & port match them to the manifolds, do the exhaust and thats about it after that it will get expensive. Possibly a webber conversion If you do it yourself about $40 for the carbie, possibly about $20-$40 for the rebuild kit & about $40 for the adapter.
I plan to sell my carbie VK in about a month for around $2200-2500 if I can, I have had it on the road since the end of September it has had a engine rebuild, gearbox rebuild, rego & insurance new master cyl, suspension bushes, new tyres & mags. Now the car is pretty good .
To me it doesnt matter how many KM are on the car its how the car is well maintained.