mid length LS Swap Headers for 79 F body

[Alponcho]

I'm interested in mid length headers for an LQ4 swapped into a 79 Trans Am. Holley has some, but on their website it says they're for 70-74? Will they not fit a '79 for some reason or is this a smog law type of issue?

[79 Camaro]

Try Speed Engineering. Yeah I know are Chinese.

[t72ss402]

I put the Speed Engineering mid-length on my 79 Malibu and they work great and still look after 6 years in the car.