B18C in my opinion; simple, cheaper and ample aftermarket support. Though obtaining the motor + GB +wiring harness + drive shafts etc for $3.5k might be hard (but then again, it also depends on who you know I guess)
Parts are interchangeable with other B-series motors, fuel will be cheap as a daily and the ease of doing the installation whilst maintaining a/c and p/s. Pretty much plug-and-play.
H series, you may have to worry about drift shaft issues + poor gearing (from what I've heard)
Goodluck.


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