I say 3.73's just due to doing highway miles, 4.10's will set you in the 3200 rpm range in 5th gear so highway won't be fun to drive long distances but 3.73's give you great acceleration without much sacrifice. Feel free to ask anything about these engines, I've been researching them for a while and testing different combinations of parts in a wave analysis system. They're great engines with a lot of stupid decisions on Ford's part. With very small modifications they can get up there in the range up LS builds. Too many people are unwilling or unable to do the work necessary though. It's expensive but it's a fun, long lasting engine if done right. Another thing I'd recommend is long tube headers from ebay I got a set for $100 and thought it would be so-so quality come to find out they're tig welded actual stainless steel. It helps with preventing reversal of air and interference between exhaust ports with a cam with heavy overlap.