Fueling & Injection - What size AN fuel line for 525hp.

I have a LS3 525hp in my 67 Camaro and I am ready to plumb my fuel line. I was thinking of going with 6AN flex from my ricks tank to the frame rail than adapt to hard line. Than go flex from the front wheel area to the engine bay, than 6 in and out of the rails back to the tank. or should I go 8AN to the enging and 6 back. I would like to leave some room for small mods down the road Thanks.

For the supply -6 will be fine but -8 is abut the same price & looks tougher & will support whatever power you throw at it.

A -6 return is the way to go.

An FYI... the fittings to transition back & forth to the hard line will likely end up costing more than running a 1pc braided line to the front.

I have teflon lines that will not harden/smell like regular braided line if interested.

Give me a call if I can help.

I like -8 an ,You will not run out of fuel !

Thanks, I am sold on 8AN for the feed and 6AN return. Any good recommendations for a good 8AN post filter?