I wouldnt worry about any of that. 1G 7 bolts almost never crankwalk,
90-91's also have the 3 bolt rear, and you will most likely destroy your rear end before you make enough power to snap a 7 bolt rod.
The 4 bolt 6 bolt combo is the best but I wouldnt get hung up on it. Most people will never make enough power to have trouble with either rods or rear end.
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