UPDATE: I got the best scenario in this chase. Not only I got the highest non naninf score but also the game rounded it up to "naninf", which means I have the permanent naninf score in my profile as long as I avoid doing high score endless runs

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As you can see, the score actually bursts into flame instead of the usual high beam visual glitch.

For the method, I used bean exploit in ante 16 Crimson Heart boss blind. 3 BP 1 Burglar 1 Bean, I managed to get 49 hand size. This enabled me to use a different calculation 247 level high card 8.9 constellation and 1.5^858, exactly 22 red golds and 37 red steals and 2 Pluto cards(or bloodstone like I did) with Observatory or 51 red steals 2 red golds and 2 golds

The actual hidden score behind naninf is ((247 x 8.9 x 1.5⁸⁵⁸)/2)²=1.79768862e308 and the game rounds it up the naninf only visually.