Sorry guys first single rail was XA (1972) when the aussie 302 and 351 2vs were made.
As to bellhousings Ive never seen a factor dual pattern setup.
A7M
I just checked my XA-XB parts book....the XB was first to use the single rail, but the XB was released late '73. So '73 is it.
The '73 build GT still had the toploader.
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