Timing is critical... and it needs to be checked - and the rate of advance - and where that advance comes in etc. Any GOOD shop should be able to do this in about 10 minutes... Your Air Fuel ratio is also important... LEAN makes heat - and while most carbs are going to be fine - just driving around - it's another thing to just be aware of.. Particularly since you really don't know exactly what you have there. A good shop can check all of that out.
The heads you have on the motor - the chamber size etc will determine the timing - the cam - all of that... once you start messing with building motors and customizing - then it takes a good shop with a dyno to accurately set up the tune on your motor. Many of the new aluminum head designs need LESS total timing than in the "old days"... the flame front travels faster etc... and the gas today - blah blah blah. Too much timing and you can destroy a motor in a day - less even... so all this stuff is "important" to say the least. Even more important if you want to "get on it" -- and be able to drive without worrying about overheating etc.
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