That car appears to be in amazing shape for an old Triumph.
Decades ago I helped some guys build one that was pretty far gone; it had roofing sheetmetal for floor pans and a really cracked-up (enamel?) paint job; car was barely a 20-footer. It ran and drove OK but after a hard freeze damaged the engine (can't remember all these years later if it cracked the block or it simply overheated after he lost his coolant from the freeze damage) he decided on an engine swap.
The original 100-ish HP 4 cyl gave way to a Ford 2.3 ("Pinto" engine) with some upgrades; it got a performance cam and roller cam followers, cast iron header from a Thunderbird Turbo Coupe, 4 barrel style intake that we first tried a 390cfm Holley on but it was a little much, IIRC we ended up using a 350cfm 2 barrel salvaged from shop owner's stash, I think it was the center carb off a Ford tri-power setup. It got the T5 transmission from the Thunderbird Turbo Coupe, also. Shop-made engine mounts, shortened driveshaft, changed the wiring from positive ground to negative ground, and a bunch of other work later..
Guy now has a 1960 TR3 that will blow the doors off a TR6 without breaking a sweat. Real sleeper with the original skinny spoke wheels, cracked paint job, etc. the only clue given that it may not be original are the Monza exhaust tips poking out, and the just-ate-a-whole-cake grin on the owner's face as he blazes by..
Richard