Flexplate Fit -- "Snug"?

[72malibu]

I'm installing a fresh TH350 in my dad's 75 Gentleman Jim, original 350 motor.

The instructions that came with a new set of Moroso flexplate bolts say that the flexplate should fit "snug" on the crank:

FLEX PLATE BOLTS
P/N 38760
INSTALLATION INSTRUCTIONS
Fits: Small Block, Big Block, and 90° Chevy V6 Engines
Contains: (6) 7/16”-20 x 11/16” Grade 8 Bolts with Washers
1. Prior to installing the flywheel, it is highly recommended that the
threads in the crankshaft flywheel flange be chased (cleaned) with a
7/16”-20 tap.
2. Also prior to mounting, check for a snug fit between the I.D. of the
flywheel and the crankshaft flywheel register.
3. Apply oil or suitable lubricant to the threads and install all bolts by
hand. Torque all bolts to 60 ft./lbs. in three stages. Begin at 20 ft./lbs.,
then 40 ft./lbs., and finally 60 ft./lbs. Always torque in a “star pattern –
begin with one bolt followed by the opposite bolt (180° away). Then
torque another bolt and its opposite, ending with the last pair.
REV. B 111513 38760INST

I have tried 2 new flexplates, one Summit branded and one Allstar (via Jegs). The Allstar has a slightly smaller ID than the Summit, but neither flexplate fits "snug" on the crank snout.

The flywheel I took off (with a Saginaw 4 speed) was snug on the crank.

Are flexplates in fact supposed to fit snug on the crank?