[Techno Duck]

Dont sweat the accumulation in the AFM, that is pretty typical i find, alot of that is just oil blowby that made it back too the AFM. Pick up a can of CRC MAF sensor cleaner and spray it out.

The crank bolt is 24mm.

I would buy a new timing belt and balance shaft belt. That will set you back less than $50. New intake manifold gaskets are like $1.50 each.

If it were me, i would pull the cylinder head before doing anything with the car just to take a look.

If you simply want to get it running on the cheap, i would remove the intake manifold and take a look at all the wiring and hoses under there. Replace anything obviously faulty and clean up what you can. Throw the intake back on and replace the belts. Change the fluids and try and start it up. That will cost you under $100 and a couple hours of time. Before you start it, take the DME relay out (disable fuel pump) and remove the coil wire. Crank the car over until you build oil pressure on the gauge.

Honestly that car looks like its going to be alot of work to get running tip top. But if your dedicated and willing, its worth a shot. How is the interior?