IIRC, the R and L series engines rotate the opposite way from the D series--and have the transmission on the opposite side of the engine bay! That means the mechanical part of the swap is more involved with them, versus the D or B swaps. (Not sure about the K series.)
I like KISS--D-series to D-series is the most straightforward swap, plus you already know you like what you have. If you're interested in better freeway MPG, you may be able to find a taller 5th gear for your transmission.
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