Best headers for 360 in a valiant

I already have the front end up pretty far from t bars, going to look into getting bigger wheels and tires which will hopefully help some in the meantime. What are the biggest wheels and tires yall have been able to fit in an a body?
What diameter? I run a 225/60-15 (26”) on a Valiant Duster. I had to extend the front fender support rod a little and roll the lip just a hair. I’m on 1.03 torsion bars and decently low. Conservative 255 on back but will consider 275’s if I go 3.55 rear. Nothing to do with headers though.

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Anyway, TTi shorty’s are where it’s at. Keep an eye on the For Sale section.