The moroso instructions show the pipe on the top of the collector, i will weld it like your pic because i can do that with the headers on.
Do you run pcv's as well ?

69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36