The best way is to bring #1 cylinder up to TDC using a Dail Indicator so that you get it truely at TDC. And then see where the mark falls.
It dont sound to me like it is out though. But even ones that have not slipped can be off some, so its a good thing to do this just so you do know exactly where your timing is.
Sounds to me like you have built a very good combo. Sometimes you just get things right. When you do they are very resistant to pinging & such. I bet it runs good no matter where you set the timing (within reason). A engine that has a combutio0n chamber that works very good will not loose as much power from having the timing off, compaired to some engines that want run worth a crap unless you have the timing within a very small window.
Also if the HB ring slips bad enough you can get a lot of vibration. But it would not hurt to check it the way I described just for a piece of mind & knowing exactly where your timing is.
It is possible that the machanical advance is not working like it should & your not getting the timing that you think you are. A timing tape & a good timing light can anwser this question. Also not having the timing vacume advance hooked to the right port can cause it not to get the right timing.
But with the MPG you quoted in your sig, and if it has good performance, my guess would be that it is doing fine. But still a good thing to check. Even when they are doing good, it may be possible for it to do better.
Jess
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