I'm running a ZZ4 in a 70 Camaro. Live on a dirt road and the grading forces a huge elevation change entering my driveway.
I used Hedman Elite shorties to get the collector above the subframe.
The ZZ4 pan fits the second gen, although I use a 9 qt CV Products pan.
I know it's not answering your question, but I believe the first and second gen subframe is substantially similiar in this area.
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