500ci rb msd timing help/advice

Have a 500ci stroker that I'm in the process of putting together . I'm looking for advice on setting the advance in the distributor, has a msd distributor that when I got engine was locked . I've read to set max advance in the range of 32 to 35deg with blue bushing and med Springs.

Engine has flat top pistons
440-1 head
Comp cam 23-707-9 solid roller cam w/1.5 rockers
1050 cfm quick fuel carb
Msd 7al
And I believe a 3500 stall converter.

I don't know why distributor was locked .I'm thinking maybe for a decent idle but I feel it should have a working advance. Car is a street car

Thanks for any input.