400 budget compression HELP +++++

Well that will be a tire fryer alright' 268/280/110, and lift of .477/.480, .050 of 224/230

To run that cam, you probably don't want to go zero-deck, cuz that would put your Dcr up at 8.4/169 psi. With a ICA of 58* In a iron-headed sbm, that can be hard to tune on pumpgas.Like I said earlier, IDK about BBS, but I can't see this aspect changing much.
However at 9.5, the Dcr is down to 8.0/159psi With an ICA of 56. If you true the decks with a light cut, say .010; that would put your Scr at 9.7, and the Dcr (at 58*) of 8.1/161psi. Either way;This should be dynomite on 91gas.You will need a traction aider.
The 268 is a pretty good cam, but you are walking a very tight line as to Dcr and detonation. I wonder if the next size bigger, would let you run the zero deck with impunity.I see comp also has a 274/282/110, with 050 of 224/230, and lift of .538/.534. This would get you a Dcr of 7.9/156psi at an ICA of 61* with an Scr of 9.7. This cam has similar duration, about .061 more lift to keep the flow going a little longer, and enough advertised to keep you out of trouble with detonation.You might even be able to run a zero-deck. The numbers for that would be;
Scr of 10.1, ICA of 64*,Dcr of 8.0, pressure 160psi. The only drawback to this cam, is making the heads work to accept the extra lift, which I would make fit in a heartbeat.
The best advice I could offer is to wait to order a cam until all the numbers are in.
I can hardly wait to see this work out.