Timing Gear Drive

alright, time to bump this for some more Q&A!!!! lol

1. I only have three of the bolt holes in my block for the cam retainer plate. Should I drill and tap the other hole? Facing the front of the block, the bottom right hole doesnt exist.
This is a late mag block.

2. Is the crank gear a press-fit? mine seems to be very tight once it hits the "step" on the crank. This is not typical of chain sprockets I have used that slide on. Gonna try boiling it to see if it helps, but in the meantime...

3. Is the chamfer sufficient to properly mate to the shoulder on the crank with no interference? I ask this because this is why crank snouts break and I'm not going there!

4. looking through my drill bits...I have a 1/4 inch cobalt bit that looks perfect. 9/32 looks too small. I see the "proper" bit to tap a hole for 5/16 bolt is listed as a "type f" (bastards) no width listed.

Anyone? I am in the mock up phase here and my final assembly WILL GO SMOOTH with all these little bugs addressed during mock up.

P.S. Thank you Louis for your great threads. I lost it and had to dig through your threads to find it. Bookmarked!