The good news is that since your engine is on methanol is going to respond well to the pipe without some of the heat and jetting challenges that you would see with gas.
Methanol also has a wider range of tune, so it’s arguably more difficult to seize an engine with.
Regarding the pipe, if you lookup vintage groups on Facebook or the web you’ll likely find out what the most suitable pipe is for methanol as well as perhaps picking up a second hand one.
Did we talk about the need to “pickle” the engine after each weekend?