Head gasket sizing

Most common head gasket i have ever used is the fel pro 1008 039. Its a super common performance head gasket for Mopar small blocks. Its 4.180 bore. Never had any issues with them running any 340 or 360 bore, all of which are lots smaller. Also have used the Mr Gasket 028 for issues where a bit more compression is desirable. Its 4.140 bore.
Cometic has the ability to get more specific, but recently can be hard to find in a timely fashion.