That is a Mk1 460 with a face lift front end. Wings/bonnet/headlights/indicators have been changed. The bumper is that of the 400 series (440/60) bodykit.
If you have a Mk1 440, then the front spoiler will fit directly to the original bumper, if you have a facelifted 440/60 however, you will need to retro-fit the the Mk1 bumper. It can be done, as seen
here. The valance then clips over the top,
like so. I don't have an image of the 440 kitted, but I do have an image of the 460 kitted up
here. This black one looks nice as it's on the 'Vega' alloys. Very rare!
I do still have the part numbers for the kit if anybody's interested. The numbers are for the 440 kit however, but the only difference will be for the rear valance, as the 460 is slightly longer (as you know). Things to take into consideration if retro-fitting the Mk1 front end would be the foglights. Unless you fabricate some brackets, the facelifted foglights will not fit the Mk1 bumpers correctly, so you'll need a set of early fogs (which have much stronger glass), make a bracket to fit the new ones, or blank them off. Please don't fit little oval non-Volvo fogs, as they look naff (sorry in advance to anybody who has!). The guy that bought my 440 done that exact thing, and it looked awful.
I'm still a big fan of the 440/460. If I ever came into a large sum of cash, I'd have a facelifted 440 (prob a 2.0i, due to the fact Turbo's are too high maintenance lol), fully kitted, but with the boot tip spoiler as opposed to the regular spoiler, lowered on those Vegas, in that lovely metallic blue (think it's 235 Pacific Blue, the indigo is Non-metallic). I'd have the Rococo interior with the CD spec leather door cards. But I digress....and dream!
As I said, I do still have the part no's for the kit, if anybody wants them I'll try and dig them out.
Dan