need help identifying a 360 block

[68gtx]

casting number says 63008921360 cant seem to find any info.. trying ti find out what year it is to get the correct gaskets,, year stamp says 20-2-heres where i cant tell is either 81 or 91, was hoping the casting number might tell something..

 

[RustyRatRod]

Look at those individual castin numbers REAL close and see if you didn't make a mistake with one. I get ZERO responses with it. ....and not bein smart, but why does it matter?

 

[68gtx]

k i will , i wanna regasket this thing , parts guy tell me it could have one of three styles of gaskets, need to figure out the year, and for the life of me i cant tell if it says 81 or 91 on the date stamp... ill recheck the casting number asap

 

[68gtx]

the casting numbers are correct, i am guessing its a 91 not a 81, i pulled the intake and its a roller cam block , so it has to be the 91..