1987 clutch and flywheel sizing

[kipps]

I have a 1987 V20 pickup with a stock 350 TBI and SM465 transmission. I tore the teeth off the flywheel due to a bad and poorly aligned starter. I'm replacing the flywheel, clutch and all other related components while I'm in there. A friend highly recommended I use a OE Ram clutch instead of buying from the auto parts store, citing much better quality for similar price.

I ordered Summit #RAM-88793, which is listed as a 12" clutch kit. I realized afterward that the stock clutch was 11.85". Will the 12" Ram clutch fit onto a stock replacement flywheel, or is 12" fundamentally different from 11.85"?

Also, is there any reason to doubt the quality of a $80 flywheel from an auto parts store?

Please, someone tell me I'm overthinking this, so I can just pick up a flywheel, and be ready to assemble the truck when the clutch arrives. I need to get that thing back into use.