[bwood]

Its not a matter of it fitting to the trans, its the bolt circle on the crank that different between the two engines. The TBI (1 piece) flexplate won't bolt to the older (2 piece) crank. The torque converter holes are the same.

I can't remember if the knock sensor for a 305 is different than the 350? ChevyTech might be able to answer that one. There are different kinds for different engines, although they may all fit in the same hole. As far as installation, it just threads into the block drain on the passenger side, nothing complicated.