great input as this is where i am.  if it is feasible i will try to get  to as correct as possible but having done 65 and 66 and making money on almost all of them i will do what makes since vs concourse  car.  really i want it to look awesome but driveable and affordable.
thanks for reminding me what makes sense.
 

Hello,
just purchased a 69 Mach 1 S Code Acapulco Blue Black interior.  it has a 390 in it but seller told me they blew motor 20 years ago and now have a 390 in from that time but he does not remember anything about it.  i am pulling motor our in a week or so and will want to figure our what it is and from what it came from.
any help in getting me started will be helpful. what  i really want to know is did they just make a 390 for the mustang or are they generic?  did ford stamp these motors with vin or serial numbers.  i will want to at the least find a correct date coded 390 to rebuild and install back in the car.  Date code on Mach is Feb 22 1969.  when looking how close do i need to get to make it as correct as possible?

of course if some one has a 390 top to bottom in the correct date code area  and wants to sell it i maybe interested. i live in the Philly area.  been out of mustangs for a few years playing with Broncos but this one came up and i moved on it quickly and got it.  so now make it look like a rose.

thanks Jerry in Philly