What kind of power levels will a stock return-style fuel system support with the proper in-tank pump? What kind of pump is everyone running? What about the stock fuel rails? At what point do those need to be upgraded? Who makes an upgraded system?

 

At the horsepower level your 408 will be making you would have more than enough fuel with a low pressure system off an old TBI 4.3 liter !

 

A 255lph intank will support probably 500+ hp, and I don't know if anyone makes a direct fit truck rail or not.

 

Let's put it this way -- Parish ran stock rails and lines until he put on the Vic Jr a few months ago. So did I. We both run 2 255 lph intank pumps.

 

408 with 15 psi I'm hoping will be somewhere in the 700-800 hp range....stock rails and lines good enough for that?

 

Should be, But what do I know I'm not there yet. lol
So I guess you will be going with a power adder...., but what type?

 

turbo according to one of his other threads

 

As long as you upgrade to twin pumps, sure.

 

Cool, thanks

Next question...will stock rails from a truck manifold fit on the SSR manifold?

 

Isn't SSR return less? not that it matters, hmm. good question.