TTI headers

I agree with your assessment of the headers as i have a couple cars with the TTI's and a car with a custom built set, but I do feel there is too much emphasis being put on header size, and granted the larger ones will probably make more peak power but when it's all said and done I firmly believe that it's the torque converter that's the most important piece on a street/strip car or even straight drag car, it's the most overlooked and is the main factor in why some guys combo's run impressive ET's and other's similiar combo's just leave them puzzled and scratching their heads.

agree. I have just 1 5/8 headers on my heap and it runs 10.70’s with them, good bit less head than a trick flow, and no roller.
Think my advice to the OP would be to keep what he has, before blowing a grand on a tenth or tenth and a half.
That said, if i did do the swap, would go the tubular automotive route over the TTI’s.. probably a bit more power
As a primary street car, would probably avoid hacking things to install the Headmans..but they likely make the most power