I'm in the middle of restoring a 79 Z28 with the original block. The machine shop called and said the original heads we cracked but fixable. I'm debating on fixing them or going aftermarket aluminum heads. There are originalists out there who prefer all original parts, and there are those out there who like the looks of a nice high polished shiny engine bay. Originality can attract higher prices, but so can performance. I'm not keeping the car, I'm restoring it and selling it. So what's your opinion, all original with as much HP as possible, or shiny aftermarket performance parts?