the 300E engine was 12V up to 93 i think, while the CE (90 up), SE (92 and up), and SL (90 and up) were 24 V and the SE and SL class had more power. They would be better than the earlier engines. However, if you're lucky, you can find a C36 engine, far superior to all of them. Shrick makes good camshafts, apparently. Theres a website, i dunno it tho.