I have a 85 Beaver motorhome with a 427 truck/AT545 combo in it. At 60 MPH it runs at about 3200rpm. Would changing the trans for a 1000 series transmission lower my RPM, give me better hill climbing/dingy towing capibility, better mileage? Would the 1000 series bolt to the 427? What would the ECM requirments be? Thank you for your help!