Help motor swap

A 1967 or older engine will not mate to a 1968 or later 904 trans, without using a special torque converter. These converters are available from several sources. Daaco for a stock type converter. I don't remember the part number, but if you call them, they will know what you are talking about. If you want a "performance" converter, almost any converter manf can build it. You also need to use the early flexplate.

PS: This info is also true for the 273 engine.