Congrats to Minnesota friend Timothy! You may have set a record for correct responses here. My source was also by Phillips, but a different book-Beechcraft Pursuit of Perfection, A History of Beechcraft Airplanes, Copyright 1992.
The only Quirk missing was that for an Experimental classed one-off that was supposed to investigate feasibility of a pressurized single engine Bonanza; the sole prototype T36TC was NOT pressurized! Strange.
But, the Beech production model 76 Duchess twin engine of 1977 had a T tail and resulted from the Beech PD 289 in 1977. And, the production Beech model 77 SKIPPER two-place trainer of 1979 had a T tail. So, the Experimental T36TC was not Beech's first T tail aircraft.
Why the current quiz aircraft was NOT pressurized, when that was the design goal, is unknown/unstated. Thanks for your correct answers.