Do the chain before it skips a tooth and bends your valves- you are way past being lucky
new valve stem seals are also a DIY task that you should know how to do
Warm it up, put some power to it, back it of and coast down, get on it again and look for smoke- best with someone behind you to block traffic and look for the smoke
report back
Start a new thread on your 4 bbl and these tests
