Hello im dan and im new

this cars being used as a everyday car.. but i want to have some fun and slid around, as the car is standard i am finding it reli hard to hold it sideways so i want to weld the diff?? and 1 got a pictures of or a guide on how to do it??
secondly i want to lower it anyone no where i can cheap lowering blocked from? and i heard that its not wise to cut the 340 springs but 360 are fine to cut?
also a welded diff is goin to wreck tyres so can someone please tell me what wheels fit directly on my 340 i.e mk2 escort wheels? vauxhall nova wheels etc... comman tyre sizes like 185/45/14 because u can find them tyres everywhere cheap lol
thirdly anyone no if there is such a thing as a quick rack for these volvos??
and lastly thanks for ya help lol