Sure does look nifty. Myself, I'd paint the oiltank and sidecover black. Install a new 932 with chrome slide and open up the inlet manifold flange to match. Install a 43T rear sprocket/drum brake.
I have always been leery of the tank parcel grid, as I had a friend die on a 67 TR. You shold have seen the top of that tank. I wonder how that felt when he slammed his naughty bits into the rack at 50 mph? I'm just sayin'......
Last time I priced a five speed, used, it was in the order of 600 bucks, wholesale for a pre-77 cluster. I would have gone another fifty for a later one. So, retail that would push it out to about 900 dollars just for that conversion. The stock gearset MIGHT fetch a hundred fifty on auction, IF it were cherry.
A seven fifty kit instead of a rebore with new 650 pistons would add about 300. Triplex clutch set up with a late alternator would add a few hun. AND, the engine uses US threads and fasteners. Easy to get SS parts.
The tight steering angle shortens the wheelbase and moves the center of mass slightly forward. Add those low, flat bars and you have a quick handling piece of equipment with a midrange monster powerplant, especially if the builder installed the 650 exhaust cam. The 68-70 forks are dual damping, compression and rebound, and are much better than the non-shuttle valve forks. Much better front brake. And we can hope that the builder installed the 69-70 swingarm, too.
Triumph never quite got it right.......the closest they came was in 69. If I had to ride a stocker, it would be a 69 TR6R or T120R. If I could change one thing, it would be to install a five speed. Two things, then I would put C model folding footpegs on it. Three.......then it would be a 750 kit. Fourth, 43T rear sprocket/drum. Fifth, aftermarket cams, or a short rod 750 inlet cam. Sixth, lightened valve train. Seventh, 750 oil pump. Eighth, 750 cam pinions. Ninth, alloy rims and stainless spokes. Tenth, alloy or stainless fenders. Somewhere in there I'd sneak in a halogen headlight conversion, a three phase alternator, Belden mil-spec. wire harness, capacitor...throw out the battery, etc. Aluminum and stainless bits.
And I am back to where I started, my 68 bitsa.