Looks like your man SF.
Not sure of the circumstances surrounding the demise of IVI. Someone else here might know.
I thyink Bush started his flying lessons at the RVAC in about 1968, and that he bought a Chipmunk before he bought the Mustang
I believe Mr.Bushe had around 200hrs total flying time in his log with about 25hrs and some aerobatic experience in the chipmunk and an additional 10 to 15hrs in the Mustang. Probably a bit underdone if this is correct.