Technical Angle engine

I am currently bruilding a brass era model T Speedster with model A running gear.

I was wondering if there was any difference when putting the engine level with the chassis ore under an angle, ore should I try to keep the stock angle in a model A.

The car will not sit that low but I will still be keeping the closed drive, I know that the rear end should sit lower than the tranny so that the oil from the rear would not go to the transmission.