From memory you can go from one pattern to the other
But cannot have both, It has something to do with the locating dowels & size of them.
In saying that it doesn't mean you couldn't put removable bushes/inserts in the dowel holes to get around it.
I also would like to have both chev & holden (trimatic) patterns on my bell housing ..
Think you'll find that all 304fi motors are chev pattern..
The dellows bell housings are cast with both patterns but only the one required is drilled with the dowel/bolt holes.
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