Nothing wrong with the GT forks. BUT....higher quality springs and an emulator seem to improve most traditional fork setups. Maybe the GT won't be better. I won't know until the forks are apart.
This is small stuff. The UCE engine is where the money will be spent. It is an unknown in the US. Things like rods and pistons. Not hard as they can be made. Carrillo and Arias do it all of the time. Cams more work, but doable. Lifters??? Engine bearings?
Top end may use parts from other bikes (modified) or some standardized parts. Don't know. Combustion chamber and flame front??? Don't know. Ports?? Clutch?? Starter ?? Ultimate compression ratio?? Head sealing?? This is not a top fuel engine. But a strong reliable street engine. This why you choose the top engine building shops to do the work and set a reasonable budget, with reasonable expectations. Experience counts big time. Kawasaki is Rob Muzzy. He knows them inside and out. Ducati has their gurus. Jerry Branch (is he still alive?) and Carl's for Harley. Ace knows pre UCE quite well. Certainly respect him on that. This is not for weekend mechanics.
I have already been advised. Keep the UCE for a spare or sell it. Put a pre unit or even unit Triumph engine in the GT frame. Build your mounting plates and sort out chain alignment. I now have a few Triumph engines. Build a temping Café Racer in the vein of a Triton. You'll have more HP and it will be cool. May be even worth more in the long run. The thought of strong traditional single still appeals to me. Nothing is ever as it seems at the start.
A thought....the KTM 690 Duke is a 670cc or so single with loads of technology. Fly by wire, White suspension, 67 hp and 340 lbs. and it rips. But, at 70 plus it vibrates. Faster more vibration. Even with a counter balancer. It is as modern as it can be. But, in the end, it has none of the character of the Enfield. It is not better, just very different and cost more. Performance wise the new Yamaha FZ-07 leaves it standing. And for thousands less. Who cares! You can chase this power curve all of your life and never catch it.
The RE is in a word, FUN to ride. It is a Lot of old, a Lot of new. An elemental motorcycle, with core values. It makes you realize that riding is fun. Not turning every ride into a race. Simply, riding. In America we loose sight of this sometimes. If too much is enough, overwhelming is better. NOT! But, try selling that to an American twenty something with testosterone raging. You can't. The GT is an Indian bike for the Indian market. You can't go much more than 45mph any way on their roads and stay alive. Pull up to the Cia-walla and the girls will smile at your red beast. Not in America. Or even in England or OZ. This bike needs twelve to fifteen more horsepower. I'll settle for ten. But, when it does, it will be superb for it's purpose. A modern bike that captures the past and the passion of riding without feeling you are flogging it to death. A modern Goldstar of sorts. I not holding my breath.....so I try to sort it out.
The beautiful Guzzi 750 retro Racer needs a dose of HP as well.