I have a '71 FJ40 with a 1F motor, Holley 2 barrel, and three speed transmission (floor shift). I ruined the motor a while back - it will start, but sounds like I threw a rod or something. Tearing a motor down exceeds my ability. I have a donor 2F motor and four speed tranny from a '76 FJ55. With limited budget and limited experience, I am planning on pulling the FJ55's motor and tranny as one unit and installing into the FJ40. Any advice on the difficulty or obstacles is greatly appreciated. Also, should I take the time to replace the clutch or any other components while I have the 55 parts accessible. Lastly, any budget-friendly accessories (headers, carb) that should be upgraded while I am reassembling it?