I agree this outboard stuff is way different.
Ive heard (and I aint no guru ) that on the 300x's you dont need an additional fuel pressure pump and it is not recommended to run anything between the fuel tank and the motor, ie additional pumps, filters, connectors ect. The 300x is all self contained.
As you know Im new to this motor as well and look forward to others comments.
PS NOT looking good for me getting a lower by this weekend. These things are way pricey compared to just about anything else out there. I can buy a complete set of Bravo's for the price of one LH 1.62:1 Sportmaster lower.