By my calc's I think a 3/16" feed line per cylinder will be adequate. A guy that converted a 2.2L S-10 did a single 3/8 line and had to restrict it with a ball valve, another with a VW used just drilled his fitting till it ran right and it ended up being just under 1/4".
I don't think a 3/16" tube extending 3/4" into each runner is going to hurt flow much. I won't have a problem with HP I am already swapped to a 9.4:1 compression 2.0 liter B-series.
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