I am in the market for a good used daycab to be used in NE-FL for the purpose of log hauling. I am familiar with Cummins and Detroits however I am ignorant to Mack engines. I am looking in the 90's model range. Specs that I am looking for with the non-Macks is 375-435hp, 3.70-3.90 gears, 9-10-13spd. Please excuse all the questonsbut, the only dumb question is the one you didn't ask. When did Mack begin using computer VS mechanical engines? How are Macks on milage? How do they compare in re: to longevity/maintenance? How are they re: HP/Torqe ??350???400???427??? Can they be turned up? Theres a multitude of E6-7 350hp's (93-99) but I do not want to be under powered. What do you think of this motor? Good and Bad experiences with Macks...Basically any infomation/opions on the 90's Macks will be helpful. I have recently seen a 93' with a 400hp. Is this a good unit.Thank You