Sorry I can't help you (although I fly Aztecs as a safety pilot), have you tried the Tach / Ops forum? I put an interesting question like yours here on the main forum and it sank unanswered like a stone. Have you tried the forum at www.pprune.org (could be .net, don't remember)? It's the Professional Pilots Rumour Network, and they have a "wannabes" forum as well as the main one. Good luck!
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz