Sorry for the delay chaps. While waiting for 24 hours to expire, I completely forgot about my challenge!
meleagertoo has it - the Bell X-14.
VTOL test aircraft - first flew in 1957. Bonanza
wings and landing gear, T-34 tail, powered by two Vipers, with thrust-deflectors.
Bill Bedford and Hugh Mereweather both flew it prior to the first flight of the P1127.
https://en.wikipedia.org/wiki/Bell_X-14