Hey Arcticat a 283 is a straight bolt in you can use the same bell housing,flywheel, clutch, it also uses the same frame mounts as your 230.
As far as alternator you probably need the brackets from the 283 but this depends what you will use for exhuast. Same starter works for both. Radiator is another question some of the 230's had a 17 1/2" wide radiator if yours is the 24 3/8" you will be fine. Most 66 283"s had automatic choke.
