Big Tom,..I have coated Super Comps 2 inchers on my BB 69. I don't have A/C or PS, but everything fits fine. I had to re-route my fuel line (tank to pump) on top of the sub-frame instead of the side,..no big deal. And if you're using aftermarket head bolts, you may have a small clearance issue with the 4 bolts on each side, just below the header flanges. I simply replaced these eight with standard bolts that have a less elevated head. I have a 4-speed car and the clutch and linkage clear fine.
Overall, very pleased. Just remember, BB headers in a Camaro will always require a little creative adapting. I don't know of any BB headers that bolt and go.
Lastly, make sure you're using BB motor frame mounts for your engine,..the ones that offset the engine an inch toward the passenger's side.
My 69 "COPO" (Recreation) has Hooker Comp Headers. I can not address A/C issues.
We had to grind one side of ONE P/S box cover BOLT for fitment. I bought these coated headers through a EBAY seller in Dallas. Drove car in 2005 Power Tour, etc so far with no problem..............other than starter gets hot and wont restart immediately after shutdown.
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