I have a 400 crossmember in my '74 so it will work in a '73. There should be NO way headers will cost $1500 to put a Poncho motor in a Nova. Any '67-'69 Firebird header WILL work. Some of the larger tube headers will need some persuassion, but WILL fit!! Mounts from a LeMans, not sure about that, but I know Classic Industries sell an aftermarket frame mount. You can find the mounts on Ebay too.
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