Don't overlook the L76.
It's 6 ltr, has the better 5364 heads but does have DOD.
You're almost certainly going to put an aftermarket cam into whatever you choose so that cost will be common.
Just change out the DOD followers with the cam change and replace the valley cover with a LS2 version.
A small benefit of the DOD engines is the extra volume
oil pump.
You should be able to find a L76 cheaper than some of the others