New Fuel Line Hose Recommendation

The Red Electric pump is 97GHP at 7psi going to a mild built LA 360 with roughly 300hp so nothing crazy. I'll give Holley a holler to see what they recommend. In the meantime, is there any way of expanding the opening diameter an SAE 100r6 hose to fit over a brass fitting? Both the fitting and hose are 3/8 inch and it has been nothing but a struggle to get it to fit back on the barbed fitting after I removed it. Need to get the car running so it can be moved to my local guy to check out a potential fuel line issue if need be.