It's a Phoenix 9. I have the sister to it. Believe they were built by Bob Godfrey. Mine is powered by an OS 61RFP ABC which is likely what powered that one. That is my Dad's old AMA number. It was a very early turnaround pattern design when things were in transition. The wing was originally longer but Dad cut off the tips to stop tail wag. He has a Phoenix 10, the only one ever built, which is basically the same plane, just with a longer tail moment. I think he still has another Phoenix 9 fuselage, as he used the wings and horizontals for the Phoenix 10. The 10 has the same engine as my Phoenix 9.

These were obviously a radical departure from the earlier designs in the series. They were also designed around the new noise limits, with higher pitched props turning slower, along with effective tuned pipes.

There is a possibility that the Phoenix you have may have had a Enya 1.20 four stroke at some point. I think it was too early for the YS 1.20s.