Lay,
I gotta say these guys on the board can tell you anything you want to know and then some.
I'd put a specific post up i.e. "I have a OPS .67 drum engine and want to know the following............"I'm gonna use an Andy Brown Parabolic pipe.....with an after market water cooled head
If you give these guys the specifics they will hook you up.
Also, John Finch puts out books for sale that you can order from the back of RC Boat Modeler magazing. Some of the articles are a little dated but I resource them all the time. They are well worth the money.
Another thing t do is borrow.......and never return.....your friends old RC Boat Modeler magazines..... :lol: :lol: :lol: Man I can kick myself for loaning mine out and never getting them back!
Hope this helps!