What do you have to spend? This will not be cheap! If your goal is to save money on gas, It will be years before your benefit at the gas pump pays you back for your initial investment. Also the resale value will most likely be less than a bone stock original 164e.

How much technical knowledge do you have? If you have to pay someone else to do the work at $75.00+ per hour when will you give up? If you can do the work yourself do you have the time?

Do you need to drive the car anytime soon? Will the neighbors, landlord, life partner complain if it sits undriven for months?

If you still want to do it heres other things to consider.

Once you decide on a donor get the whole car and keep it around till you're done, or you will be searching for the parts you left on the hulk when you sent it to the crusher. Plan on using the transmission that comes with the engine. Choose something with easy to find replacement parts.

In your previous post it was suggested that you use a B6304F engine from a 960, with the 4 speed AT and locking torque converter. Thats your best choice for a good trade-off between power and economy.

Let us know what you decide to do.
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Lee 75 244 (80k original miles) 79 242 65 220 project