[toolboxchev]

I would not worry so much about looks comparatively to your overall everyday performance.

With those 63 or 64 cc heads your heading into a premium fuel requirement if my entry level skills are suited, others are most welcome to chime in on that one.

It would be nice to have the old school look and the performance increase from the vortec heads.

Start looking into your static vs. dynamic compression ratios with the cam you currently have. There are many calculators out there to help with this.

With either also if your paying attention to your work you will have a winning combo as long as you dial it in.