The ephemeral “Turbo B-17” was a TB-17F (42-6107/N1340N) air tanker owned by Aero-Flite of Cody, Wyoming. This Fortress was re-engined in 1970 with four slender RR Dart 510 turboprops. It barely had time to demonstrate it potential though. Sadly, it crashed only a few moths after it’s first flight, in Aug. 1970.
They managed to place those slick Darts on the B-17 big engine nacelle quite nicely. I don’t know you, but it looks not totally sacrilegious to me. Imposing certainly.