Here's what I would do in your situation. I would run that engine as is. Don't look for the thinnest head gasket. That's a mistake too often repeated. Look for the head gasket with the smallest compressed volume. That's what you're lookin for. Have the heads milled .030" but NO more, or the intake may not fit. It'll still fit with the heads milled .030. This way, instead of taking heavy cuts on the block or heads and having to mill the intake you won't have to. Now whatever intake you choose you can use on any other small block, because you will not have milled it to match heads or block. Then, I would run a camshaft similar to this:
CAMSHAFT Notice it's low lift, so you can use the cheap Comp 901 spring and it's ground on 108 lobe centers. This will pick up cylinder pressure. Also it has 225 @ .050" duration which will have a noticeable little chop. I'd stab it in right where the cam card says. An Edelbrock 650 AVS2 would be perfect.