Racing Fuel Systems

Looking for some input for a new fuel line. Currently using a Holley chrome 3/8" dual feed line on a 750 DP. Don't really like this setup. Thinking of using / making a setup similar to the 69 Chevelle L78 with the "Y" block distribution or the 70 Chevelle LS 6 type using a "T" block distribution. Do either of these type have flow or capacity limitations? Since the "T" block style feeds the primary bowl from the branch of the "T", could it possible starve that side given it is a straight run to the secondary?
Hoping to get some good input from the knowledge people on this site. I do not have a good understanding of fluid flow through tubing and fittings.
Thanks for any and all guidance.

The 3/8 Line works fine, flows enough. Y or T block will work as well, as long as you don't try to use too small on the fittings. 1/4" pipe or larger should work on a street app on gas. Methanol use 3/8 or larger.