Good Slant 6 Set up?

Build yourself a decent cylinder head.

Yes.

Ported,over size valves

Yes.

shave it .100 for some compression

No. Just shaving this much or that much metal off the head is the wrong way to do it. You really need to calculate your combustion chamber volume accurately, factoring in the piston deck height and cylinder head gasket compressed thickness, and figure out your actual compression ratio, and then you can make a smart, informed decision as to how much to shave off the head and/or block.

3.55 gear

Optimal rear gear selection -- like camshaft selection, intake and carb selection, compression selection, and just about every other aspect of a performance build-up -- is a function of the car's parameters (weight, etc.) and how it's going to be driven. 3.55 is usually not a sound choice for a street-driven car with an automatic or non-overdrive manual transmission.