Post this up in the Formula section and see if anyone on there has a similar set up on their 242. You have a 1.47 drive ratio and were spinning a 15" rev 4 prop on an alpha gen 1 with the old engine. Introduce yourself and tell a little about your project.
You can also do a search for 242ls and dig up what is in the archives. I am sure you will find quite a bit of interesting info.
This section is more for the "hows" and "whats" of the forum itself.