the top mount on your 230 where it bolts to the block when removed is the same as the block on the 283, when you get your engine get all the accessories you can, exhaust manifolds, intake, carb, it has been awile since I looked at a 66 head but I don't think they accessory holes drilled in them, alternator mounted on front side on exhaust manifold on drivers side. choke works off spring on intake next to carb should come with engine, I don't remember if the throttle rod is the same length but would be easy to fab if it is longer, radiator saddle may be different for the larger radiator you might want to check how wide the opening is in yours or if it can be enlarged for bigger radiator.
