As for timing the first thing to do is find top dead center and see if your marks on the dampner are correct. The marks can be off for a variety of reasons so find TDC first!
When I find top dead center the piston all way up the lines doesn't match. But with the lines matched up the piston has started to move down just a tad. I know i added 80 fronts an 88 rear jets an tge stumble/hesitating is gone off start.
