Congrats on the purchase!
In addition to changing the
oil, you may want to doublecheck what
oil filter is being used. There has been some discussions comparing a 'racing' filter vs a regular one.
Example, Wix 51515R is a racing filter but only filters 60 microns. The Wix 51515 filters down to 20 microns.
Roush site for my 402 engine calls for the Motocraft FL1-HP or equivalent. This filter is a 20 micron filter.
Be aware of how you are going to use your car and what type of filtering you want to avoid unnecessary engine wear.