Flywheel Identification

75greenduster, if I'm seeing the photo correctly, that appears to be a slant 6 flywheel.
ANY V-8 flywheel will have 2 holes that are closer together, it's dead obvious once you see one.

A slant 6 flywheel will bolt to a small (or big) block, but one hole will be half off, no matter how many times you turn it to the next bolt hole.

I'd still get any (V-8 ) 10.5" flywheel you can lay your hands upon and have it balanced with the assembly when it's done.
You'd be far better off and it WON'T shake.

SEE PIC FOR DETAILS REGARDING THE 2 CLOSER BOLT HOLES AND THE BALANCING HOLES!!
Pictured is an 11" truck flywheel, but the layout for a car 10.5" is the same.

Mark.

11 inch 360 FW.jpg