Lyman 49th Ed. lists the following sight correction formula in Appendix B:
M = (D/R)*S
M = Movement in inches
D = Impact deviation in inches (8")
R = Range in inches (900 in this case)
S = Sight radius (5.266"+a rounding error on these Mitutoyo calipers, calling it 5.25" to ease math and still make the point)
M = (8/900)*5.25
M = 0.008bar * 5.25
M = 0.046bar but we'll call it 0.05" even
So, the muzzle will need to be nudged approximately five hundredths of an inch. Yes, a babbitt can easily correct your point of impact.