The Bijou was used as a movie theatre throughout the 1960s, reopening as a Broadway theatre in 1970, so Oh Dad, Poor Dad couldn't have played there.
And according to IBDB.com, Sly Fox opened December 14, 1976 and played through February 19, 1978 at the Broadhurst. During that time, the Morosco had the following tenants, opening dates as noted:
The Innocents - opened October 21, 1976, 12 performances
The Eccentricities of a Nightingale - opened November 23, 1976, 24 performances
Something Old, Something New - opened January 1, 1977, 1 performance
A Party w/ Betty Comden & Adolph Green - opened February 10, 1977, 92 performances
The Shadow Box - opened March 31, 1977, 315 performances
Golda - opened November 14, 1977, 93 performances
Side By Side By Sondheim - opened February 22, 1978, 384 performances
So the Morosco was fairly consistently booked during Sly Fox's run.
Begin at the beginning and go on till you come to the end: then stop.