It depends on what you can live with.. back in the 70' and 80's it was not uncommon to run stupid ratios on a daily driver Say a 1750 pound cal 1776-1835 125 130 cam 40x35 4.37 r/p 10 ish comp 3.80 2.06 148 104 165 tires.. might drive from Newhall to ocean side to visit a GF taching 4k..car ran mid high 13's on slicks and stinger no pass seats. it has been done, but would not recommend it as a steady diet.. With the very affordable 82-84 cranks, low cost CNC heads and such, it is easy to build a car that will run a second or more under those times with a standard ratio box...You have to sit back and analyze what you want and need.. if it is your only transportation.. go mild on cams, and gears and compression.. Do you have any goals, or requirements for a specific use? or is it a daily or 90/10 street strip or 50/50 Just to say 170-180 hp leaves too much room for conjecture.. To recap, you don't need close gears with a milder cam, or a bigger engine..While a 2007 or 265 can run nice and make good power, it is no where as flexible as a 2276 2332 etc.. the bigger the motor, generally the more you can push the envelope with out penalty... What is the plan .. more info...