ALL models of Boeing 707 and 720 aircraft had turbocompressors for cabin pressurization, and in addition SOME also had provisions for engine bleed air for cabin pressurization as well.
If engine bleeds were used, cabin ventilation was rather severely compromised, and descent had to be started much furhter out due to the low volume of bleed air available.
Having said this, if ultimate range was a consideration, using engine bleeds improved SFC by approximately 2.5% with fan engines, 2% for non-fan engines. In this case, turbos needed to be started every hour or so. If this was not done, they might not start at ALL
due to cold soak, and be unavailable for use during descent.