I put a rebuilt 235 in my 1948 Fleetline Aerosedan. It's running great but my buddy and I want to install an HEI ignition. The 235 motor is a 1954 with a standard transmission. From research on the internet, the distributor gear looks like it's steel, not cast iron. I attached a picture of it below. So I've read conflicting information about the gear. Langdon's site says that I definitely need a steel gear on the distributor. Another posting I saw on a Chevy site said you can use a cast iron gear with both steel and cast camshafts but you can only use the steel gear with a steel camshaft. From what it said, all the Chevy replacement distributors had the cast iron gear after 1954. I'm not sure what to believe. Also, is it better to get the mini HEI distributor with the external coil or the large-cap version? I don't care that it looks period correct. Thanks in advance.