welcome. Looks like you have some work ahead of you. The list of parts that are allegedly on the car are bunch of thrown together parts. What was teh $1200l for the replacement motor? DId they put in new gaskets, seals. bearings, water or oil pump or is it a junkyard motor. All I see is a new pickup screen.
Here is my 2 cents ( do not take this personally as I'm not pulling apart your car. I am just trying to pass on 40 years of working on these cars and what works)
no one wastes money to port stock heads unless they are going for a nostalgic look or in a secific class. For the same $300 you can bolt on a set of explorer/gt40 heads and pick up 30 hp
E303 camshaft with that combo is a dog. the power band doesn't kick in until 3000 and has a 110 LSA so the idle is going to be crappy
Underdrive pulleys will create charging and cooling problems, especially with your stock 65 amp alternator. Not worth the 5 hp at 5000 rpm. Put a set of stock pulleys back on
Swap out the stock 65 amp 2g alternator with a 3g 130 amp
Looks like they replaced the stocl clutch fan with a cheap flex fan. I'd gp back to the stock clutch fan setup
MSD ignition box is worthless on a stockish n/a motor and they fail more often then not. MSD distriibutors are worse and will fail at some point. Better off running the stock ignition and a FOMOCO or Cardone distributor.
What MAF? Did they reuse the stock 58MM one? That is a chokepoint
What ratio rear end gears? Did they replace the bearings and seals?
What brand cluitch. Did they install a new alum quadrant and firewall adjuster? What brand cable or did they not replace that?
Welcome to Stangnet. Like Mike posted above,you should invest some time and money in those upgrades/changes. As you go forward make sure to ask any questions to issues you may encounter. There a lot of technical resources available on this site. Good luck on your project.