What?....True TDC is found with a marker, some masking tape, a piston stop, a piece of clothes hanger wire, and enough room to be able to manually turn the engine via the crank bolt.
Errr.......Ahem.
Fashion a "pointer" out of the piece of coat hanger wire, bolt it onto something that wont move, and bend it so that it is pointing at a fairly accessible part of the balancer.
* it may be a good idea to remove all the plugs.
#1. Remove #1 plug.
#2. Using "finger on hole" method, bring piston to TDC.
#3. Turn engine backwards from there 1/4 turn by hand.
#4. Screw in piston stop. (this can be something you buy, or something you make. I made one out of an old anti fouling plug extension. Tapped the center of that dude, screwed in a long piece of all thread through the center, put a jamb nut on it, and done. All that junk found at either Autozones "Help" section, or Home depot.
#5. Turn engine forward slowly by hand, until the piston hits that stop.
#6. Now,.......clean off the balancer,...and put a 4" long piece of tape on the balancer in the area that you have your pointer pointing at. Place the tape so that the pointer is pointing in the middle of your tape.
#7. Mark the tape where the pointer is pointing to.
#8. Now spin the engine backwards, away from the stop until it contacts the stop again.
#9. Mark the tape.
Now all you gotta do is measure the distance between the markie-dudes, and divide that in half. Make a mark between the two marks on the tape, Zackly in the middle.
#10. Remove piston stop.
#11. Rotate engine until your pointer is pointing at the center mark. That is true TDC. Make adjustments to your timing marks to accommodate this, and you're good to go.