I'm setting a bowl in an old house.

The floor slopes towards the front of the bowl by about 7/16" over the front-to-back of the bowl footprint. But the top of the bowl--where the seat goes--is close to level. (It's level side to side)

Wondering if the top is supposed to slope back and I need to shim the bowl in front. It would be a little bit of a job to do that neatly.

Can anybody advise if this situation will have any effect on the functioning of the toilet?

Thanks.