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Ok so I'm new to the import world and I would like some advice. I have a 91 hb STD and I bought it to run on the hwy, I drive about 2500 miles a month for work, gas $4 truck = not fun, so I want to swap out the under powered db1, and 4 speed, not lookin for 150hp just good mpg and around a 100hp any help would be great

 
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You won't notice a difference of 9hp on a daily driver, it will feel just as slow. Swapping in a 89-91 d16a6 cam and a d16y7/y8 cam gear would give it a few extra hp on a budget though.

 
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I have 70hp dpfi db1 I have thought about mpfi cam and cai but then still have that 4 speed so that's why I was going to swap if I can find anything around here