That'll run good on 87 prob, back in the day running my 440-6@9.8:1 with single 850DP I ran what we called 4 star leaded fuel, approx 97 octane, decided to add unleaded to it, and boy it sounded so much stronger, didn't go much faster but.

1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987