headers

For off the shelf headers, how much if any more HP is a fenderwell header (Say Hooker 1 7/8 tube) worth compared to underchassis header (TTI 1 3/4 tube) in a 600-630HP BB combo that doesn't see over 6500 rpm?

The fender well header is too long for just about everything

how long is a hooker fender well header?

On your deal I would, and have, buy and use the Hedman A body fenderwell 2.0 inch primary pipe with the 3.5 inch collectors
They fit better (allow a taller front tire easier) than the Hookers in either the 1 7/8 as well as the larger 2.0 inch A body BB headers

The last set I bought were like 42 inches for the shortest and 44-45 for the longest.

They have to be that long to get the collector under the car.

I just checked and summit says the Hookers have a 43 inch primary tube.

Thank You