ENGINE SWAP

With that 10.1:1 combo, is that premium gas only then? What do you think.
I’ve got a stock 904, stock torque converter, even the stock one-legged 7.25” with 2.76:1 highway ratio. I could upgrade all that stuff except I don’t drag race or burn out or even peel out. I am interested in the possibility of running 170mph however, which I just read you could do with that SRT8-392 - that is amazing! Maybe I need a better overdrive to reach that high given the redline.
What kind of cam overlap difference is there between the 375hp version vs 445hp, that is to say, how poor would the mileage be trying to commute between them?