JCR ,
I am running the 320 aluminium heads , everything fits same as stock BBC.
Only thing is Pushrod lenghts(needed longer ones and the exhaust studs stick up higher because of the .600 raised ports and hit my valve covers ( the locking nuts actually do with stud girdle usage) had to double up on the VC gaskets to clear them, other than that should be no problem swap..
Good Luck
ps I am running the Crane Gold split type girdle