Regarding bumping ads in the classifed forums, we've just installed a new (customized) add-on that will change the way ads are bumped to the top. Please refer to the post "Bumping Classifed Ads" for details.
I did a 3 mile fitness test a few years back on my Trek. It was part of the Carmichael Training Method.
I don't remember the time, but it rated me as an average, but fit rider.
I never tried a 1/4 mile test.
When I was into mountain biking, building them up from a frame was a way to save money with used, but current parts.
-Gradually, I began to build up from a frame to in order to ride exactly what I wanted.
If that Western Flyer is all original, I would keep it intact and find another fork for your Spaceliner.
- to answer your question, I would not consider it blasphemy or heresy to use the Murray/WF springer fork on the Spaceliner.
I don't think there is a date code on the fork, but there...