Bill,
Whilst I dont have the same setup as yours, I do have some experience with 454's and the smog stuff.
My 1987 454 powered Suburban is TBI, but similar, and I can tell you that you will never get the old AIR Injection Tubes out, so dont even try!
None of the After Market Headers will have them, but they are not super expensive... I got the pair from Rock Auto for less than $50.
Whatever Headers you decide on, if you can stretch to it I would get Ceramic Coated... the last forever and remove much more heat from the engine bay..
The obvious choice would be Banks, but weigh the cost of the whole kit at about $1900 against the headers alone at $800.
There is a used set of headers on Ebay from an '84.. he says they are SS, but I dont think so...
My '84 has the Banks Power kit on, and I can confirm that the sound is mellow, and the darn thing flies!
Next to consider, is Doug Thorley Headers... They come in around $700.
Check out Hedman, Hooker, Flowtech, JBA, and even Summit and Jegs, although not all of them do Smog Legal stuff.
The tricky bit is figuring out what will fit, as the is no direct parallel between Trucks, and Motorhomes, and emissions years... For example, My 87 Suburban has TBI, a single AIR injection Pump, and Cat, yet was made before your M/H!
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My name is Steve.... and I am an Alumaholic!
Working in my Garage is like playing TETRIS with Tools!
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