Howdee bruisedlee, two things I can tell you, any 650 pipes will fit any 650 no matter what the year.
That doesn't hold true for carbs though so your heads will only fit CV carbs not the older mechanical ones.
Ask Manjisan about fitting 750 carbs to a 650, tuning might be simpler but you have to rejet and use pod filters and a year down the track he is still fiddling with them...I'd stay stock if I was you.
These carbs work perfectly well when balanced and clean inside.
Nice score on the bike, that would be a $2k bike here in New Zealand, personally I like the rake of the custom 650, almost a chopper but without the stupid seating/riding/pegs arrangement.
Cheers.....Hush.