Back in the mid 90's I exchanged emails with a guy who'd paid to have his FHC changed to DHC.
IIRC, it was painted Inca Yellow and eventually part exchanged at Robsport for a genuine TR8 which they may have restored. Eventually he sold it and bought a TVR Cerbera. He'd had the DHC conversion documented on his own website but was advised to remove it from the internet for legal reason as he'd openly voiced all the problems he'd experienced.
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, S/S Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes all round, Anti- Dive, Strut-Top Roller Bearings, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 14" 5 Spokes or Maestro Turbo 15" Alloys, Cruise Lights, S/S Heater Pipes, Replacement Fuel Tank. No Door Stickers. Mine since July 1986, V8 from 1991 courtesy of S&S V8 conversion and big brake kits.