47 degrees initial time? help!!!

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Transfer-Port sync; 1)set the transfers down to about square under the plate, to a little taller than wide. 2)Adjust the idle speed with bypass-air,and idle-timing. 3)Limit your power-timing. 4)Bring in the advance at a rate that the engine accepts and likes. 5)Vacuum advance; If it pings under light acceleration,you may have too much idle-timing,too fast a curve,or too fast a V-can rate.Cans are adjustable.Typical street-cammed SBMs may run about 16* to 20* initial, and 32*to 36* power, and up to a theoretical 60*for cruising with the vacuum advance having brought it's load in. This is usually abreviated as 18/34/60.
If 60 sounds like a lot, it is. But it's highly unlikely your engine can achieve it. You would have to be cruising at an rpm after the mechanical is all in, but also with a ported vacuum signal high enough to bring in all that the can has to offer. The two are mutually un-exclusive. With 3.55s and an all-in timing of 3400rpm, this would be 76 mph. But at this speed, the ported vacuum signal may have fallen to a point where only 10 comes in by V-can, so the cruise timing might only be 34 plus 10 =44, a nice number to be sure.
At slower speeds say city cruising at 2800rpm; the all-in mechanical might be 28* and the V-can now bringing all it's got of up to 26*(if modded), so the total could be 28 plus 26 =54. Perhaps a tad high;perhaps not. That's for you to establish.Perhaps the MSD will get by with less. My combo likes 28 plus 22 =50*with an old Accell Super Coil fat-boy;Kettering at it's finest.IMO at least.