I have a '67 w/ a 250; want to convert to small block; have a line on a 66 w V-8; will all the powertrain pieces bolt right on the '67 e.g., engine. tranny, drive shaft, rear end?

yes

yes the will all bolt rightin make sure to get the frame engine perches and the x-member. some 6 cyl did not have the double hump for dual exhaust.