Found my dads original 1971 duster!

Short answer....no. Every engine is different and timing needs to be set according to each engines parameters, you shouldnt just take 16 as a number and set it there. Anyone who is experienced with tuning engines should be able to time it for you as part of a complete tune-up. Chances are that it may end up around the 16ish mark though :)
All correct sir. But for testing purposes, he needs to find out. Plus it needs more than 4 degrees.