Drag car brakes

Lots of variables to consider, and no single "applies to all" answer. What master cylinder are you using? If it has them, are the residual valves still in place? Piston bore front and rear, master cyl. bore?
If it were me, I would plumb in an adjustable proportioning valve regardless- for $35 you can fine tune your system and save yourself the hassle of having to add it later anyways, and cutting into your nice new lines.
Adjustable Proportioning Valve (doctordiff.com)