273 Headers (weird combo)

" If I look at headers for the 318 or 340 they should work with the larger port heads correct? I see TTI is probably the best option but these are kinda temporary so wondering if any cheaper brands will work.........
TTI work fine for me, I would expect others to fit, but not ever as well from my experience, you have a tough decision to make bang vs buck in a short-term situation.
My experience is with a stock head 273 in a 62 Polara500 (Dart).