L-78 396 cylinder head question

[HS PROFESSOR]

I'm putting together a '69 396 / 375 hp motor and have a question regarding cylinder heads.my car was build 0 1 C and my block is a L 20 8.i currently have no heads,just the shortblock. how important is it to have correctly dated heads. the block is original but has been decked and the numbers are gone.how crazy should i go??? it will never be a numbers matching car again.but i plan on restoring it to L-78 specs.the car has its original BV coded rear,and numbers matching trans,any feed back would be greatly appreciated.are any 840 heads considered ok or should i hunt down a set close to my motors build date.i'm not looking to restore and sell but if the car will be worth more down the road then its worth it to me. thanks.....bob