Hard facts...
416 Batten w2 roller motor
tti w2 1 7/8 race headers ~635hp
Hedman Hustlers 1 7/8 ~665hp
Hedmans were better from 3200-3500 and up. No low end torque loss.
394 ede headed engine with 1 3/4 Hooker SC's pick up ~30hp over the tti step headers.
360 w2, 1 7/8 tti race headers 527... 1 7/8 hookers 563
Three strikes and your out in my book. It isn't an isolated event, even with a different head combination. Same results.
IMHO, tti's are nice headers for a street application, even the race headers, and limited strip use as FIT is the primary issue. If it's a race car with very minor street use... look elsewhere.
Wish I had some header data/comparisons on a 350-450 horse, 340-360, but I don't. I may have another 360/ede head engine coming up but expect it to make in the 500hp range.