Main Studs??

Challenger - This is not something that can be checked at home, correct? I have a dial bore gauge but there's no way to tell the alignment is correct. Reason I ask is my latest block is studded with a fresh line hone. Would certainly like to be able to tell if it was done properly.

I think you could do it at home ? why not ? Do you have a Dial Bore Gauge ? ....even a cheapo 2-6" would suffice in 1/2 Thou increments ?
They only cost like $90 Bucks... great for checking Bearing Clearances etc at home ?
Set the cheapo gauge to "Zero" off your Crank Sizing.... then measure the Bore WITH the Bearing in there Torqued up.... Presto... READ your Clearance.
If you JUST want to check the Main "Bores", set a Micrometer to 2.9425" on an RB Engine(440)and then transfer as "zero" on the Bore Gauge, go in and measure "vertical", and 45* Off either way.... check straight & round.
As far as Alignment DOWN the Block.... all a Guy can do is look visually for any evidence, or lack thereof of Cross hatch from the Hone on particular Caps,
or,
Get a machinists straight edge than will span 3 Caps, and start with a feeler gauge.

Nonetheless,
Plasti-gauge is for goofs !
Yes, the Bore Gauge WILL leave a small "pecker-track" across your bearing... just wipe it clean... with a soft lint free cotton rag on your finger.
Kinda gratifying to get your clearances right !!... and "see" your old Bearing Clearance marks 2-3 seasons later, still there on the Bearings when re-freshening an 800 hp deal ??