NO DONT DO THAT!
VTR alloys are made for the offset of the VTR/VTS disk rear beam which is about 5mm wider than the drum rear beam.
Therefore the VTR wheels will be sitting about 5mm too far in on your car.
All you need to correct it is some cheap 3mm halfords type spacers (yes 3mm is sufficient and safe) which will space the wheels out enough to clear the arches.
Do not smack your arches in as this area isnt particularly strong and is prone to rust at the join with the boot so if its upset of damaged then itll be catastrophic in the long run if things are weakened.
Heres a link for 3mm spacers
http://cgi.ebay.co.uk/3MM-ALLOY-WHEE...item2a07825b37
5mm spacers if you want to be 100% certain
http://cgi.ebay.co.uk/5MM-ALLOY-WHEE...item27b231dee2
They are less than £10 per pair with free postage.