the 6-pac scoop is a mighty big scoop. Have you mocked it up?
The engine is offset towards the passenger side, and unless you chain it down, it will torque over to the passenger side, when you gas it.
The more torque your engine makes, the more it will rotate.
If you have a manual trans, then on decel, the engine will be torqued over to the drivers side.
If you still have the original style mounts, then fore and aft movement might also be a factor.
If your engine shakes, that's another factor.
I'll tell you what I did, take it for what it might be worth;
I installed a tasteful(IMO,lol) oval alloy air cleaner centered, on the top of the hood, and put the hole ,slightly bigger than the airhorn, wherever. Then I fabbed a box to sit on the airhorn, and sealed it to the underside of the hood with flexible foam.
Had I wanted to, I suppose I could have put the entire carb in a box, and so, it too would have run cooler. But the first attempt worked so well, that I just left it alone.
Whatever;
If you chain the engine down, I think 1" all round ,would be plenty. My hi-torque and clutched 367 doesn't move around much.
