[superbluecivicsi]

basically, wiring will change. which means more work. obd1 swap will be a direct swap, because all it requires is removing the old block and putting in the new. obd1 is a much easier obd to work with. obd1 is more user friendly. obd1 is less demanding emmissions wise. so your going to buy an engine assuming it has lower miles?

in the end, if your concerned with mileage, which, im assuming your concerned with engine health. a compression and leakdown result is a much better indicator of engine health.

ex. i would prefer an obd1 b18c1 with 100,000 miles with a compression result of 200psi and 6% leakdown result across the board than an obd2 b18c1 with 40,000 miles with a compression result of 175psi and 15% leakdown results across the board.

"assuming is the mother of all fuckups."

actual results are much better to work with.