Hi and welcome to our corner of the world.
You didn't say which direction the overall project was headed but I saw you posted from Phoenix. If you are thinking about having some pinstriping type stuff done you might want to contact Andy's Pinstriping right there in Phoenix. 520-241-6224. He will be out here on the New England scene for about another 3 or 4 weeks before he heads back home to AZ.
Andy did some lines on my 37 Chevy last Saturday and he is excellent.
Like Twisted told you, anything that fits on the back of a Small Block Chevy fits on the back of your 230 just be sure to keep the starter correct for the flywheel size. To keep from going blind counting ring gear teeth use a tape measure. The 153 flexplate is 12 3/4 inches across and the 168 is 14 inches across. Replacement flexplates may or may not come with 2 different bolt circles for the torque convertor so try to buy one that has the 2 convertor patterns. Unless you plan on goosing up the horsepower the stock TH350 convertor will be just fine.
Nice sounding ride, good luck
