firewall mounted master/clutch cyl.?

i am in the process of mounting the master/clutch cyl. on the fire wall of my 47 desoto. the fire wall is angled back about 12*. can i mount the master/clutch cyl. at and angle or do they have to be level? i`m using the pedals from an 88 ram 50, the master cyl. from a late 70`s truck(non power brakes) and a wilwood 3/4" clutch cyl.

I've seen several factory setups (mostly GMs and Harleys) over the years where the MC that were run at a slight angle so it really shouldn't be a problem as long inlet holes are contiounsly covered with fluid.