WHBM... I think there were two re-engine programs for the 727...the Valsan Super27 conversion of the -200 which used P&W JT8D-217 engines in the side pods (basically MD-80 engines-correction per WHBM) with the original engine in the centre duct unchanged (used by FedEx)...and the Dee Howard Tay QF conversion to a fleet of 50 ancient 727-100s of UPS which used 3 Tays with the centre duct being redesigned and enlarged
See this key thread post#23
Three-holer - the Boeing 727 in Europe - Key Publishing Ltd Aviation Forums
UPS sample photo
Photos: Boeing 727-31C(QF) Aircraft Pictures | Airliners.net
FedEx sample photo
Photos: Boeing 727-2S2F/Adv(RE) Super 27 Aircraft Pictures | Airliners.net