If they are standard port EZ heads then your biggest gain would be opening them up to MW size. Once you do that you could bolt on a Super Victor + 1050 Dominator and go to town.
My dad's 440. 12 to 1, Indy SR heads, standard port. .630 lift Hughes solid flat tappet cam. M-1 with 2" adapter to a 1050. 2800lb challenger, with a 5200 stall and glide. 10.0 to 10.20 anywhere.
We added the Indy 4150 intake, and kept the 2" inch adapter. We ported the tops of the intake ports to match the height of the MW intake. Car started running 9.70-9.90 anywhere, and wanted to be shifted at 7200 instead of 6700. Night and Day difference.
