Anyone with experience building tri y headers

It all started with a bunch of pipes and a challenge to build a set of tri- y headers for 360 65 Barracuda ( since nobody makes them ) haha since my shoulder was rebuilt ( been a year)it is finally time to get it done, been in the garage looking at parts for the year. Have the top part mock up to the first set of ys , now for the 2 inch pipes. Here is the question is there a special length they have to be to the next y ? Have to add primary’s are 1 5/8” to 2” to 2 1/2” exhaust . So far 50 bucks and 6 hours and no room for anything haha , the two photos of Chrome is the pattern of thought I,m using.

C26BD658-F7C8-412D-84C4-B020ED4840D4.jpeg

49332691-56F5-4187-9F28-926E4052E01B.jpeg

D54D3349-F985-49D7-8F1C-B35FEB614F85.jpg

AFA15C8D-FA78-469B-B6FD-2B922B1F17D8.jpeg

EDFA1316-DD7A-4FB4-8108-798A5E2DC561.jpg

D26E669B-ED39-4D0F-B541-BA714A32C6F2.jpeg

E9E2D15C-3DE6-4E5F-8B39-B0B81890E442.jpeg

BE7CC115-E35B-49C8-A306-FB41900CAC08.jpeg

F686C928-D334-443A-B360-E4D0A3256EDB.jpeg