I managed to put a set of full length coated Hooker Super Comp Headers (1 7/8 primary, I think) on my 79 Z28 with only having to pull the 2 motor mount bolts out and jacking up the engine slightly. I did scratch them a bit because it is a TIGHT Squeeze doing it this way, especially if you have AC. They did start to rust around the welds a little bit over time but dont look to bad.
Another point, my friend had a stock 79 WS6 Trans Am. Those cars, with that suspension package, seem to sit a little lower then most other 2nd Gen cars. When he put headers on it, once in a while the headers would bottom out on the ground. Some full length headers sit below the engine frame girdle and are easily dented on the ground, when going over bumps or hard braking. I would stick with the cheap headers first and see if you run into problems.
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