225 Slant Six Crank but Won't Start (Fuel but No Spark, Dist. Rotor turns)
The rotor position might be tough to see "down in there." Basically it is coming "to" corner to corner, IE the rotor contact is moving CW towards the cap and should be aligned "at least" one corner of the rotor to the leading corner of the cap. It will NOT be "after." But remember distributor postion......which determines where the points open.......should be set first. Again don't do this at TDC, do it "where you want" timing set.
Bring the marks up to 5-8BTC or so, then adjust the dist body so the points "just open." Do this by rotating the dist "far enough" retarded (CW) and then "come back" CCW with the dist. body until the points just open. Use a test light, voltmeter, or ohmeter, depending on the situation. Doing that should put the timing VERY close. It WILL start and run.
AFTER you set the dist body, it should be easy to set the cap on/ off or mark the tower, and SEE where the rotor is in relation to cap.