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The BSHC charts are made at full load. Normally cruising speed is in that island from the factory.
I think combo #4 would be the way to go.
After doing this 5 gear would only be for cruising. It would be nearly useless for going up hills or passing.
I plan to do something like that for my car. Where I run really tall gearing when I swap the engine and transmission. I will build a high compression 6.7L LSx serries engine bolted to a 6 speed with a top gear of 1:0.5 and use the original 3.08 diff gears for testing. At 70 mph it should be turning about 1400RPM.
I plan on swapping the rear diff and will chose gearing based on my tests with the 3.08. I figure I will keep the 3.08 or go to 3.23
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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