I know both songs. Everlasting Love, written by Buzz Cason and Mac Guyden, was a hit for Robert Knight in 1967, Carl Carlton in 1974, Rex Smith & Rachel Sweet in 1981 and Gloria Estefan in 1994. Estefan's version reached #5 on the adult contemporary chart. Everlasting Love is one of only two songs to be a top-40 hit in the 1960s, '70s, '80s and '90s. The other is The Way You Do The Things You Do (Temptations, Rita Coolidge, Hall & Oates with David Ruffin & Eddie Kendricks of the Temptations, and UB40).
She's A Bad Mama Jama – I'm still trying to figure out what a "mama jama" is – reached #2 on the R&B chart in August 1981. It was #2 for eight consecutive weeks, unable to get above Endless Love by Diana Ross & Lionel Richie and then the Four Tops' When She Was My Girl. Carlton had nine top-40 R&B hits including Smokin' Room, Private Property, Drop By My Place and a remake of the Four Tops' Baby I Need Your Loving.