1. In terms of blocks, the offering from RHS (PN 54903, $4,840) is a thing of beauty. Their Clean Cast Technology gives the block an excellent finish quality. And for strength, they use heavy duty A357-T6 aluminum. The block is also dry sump friendly with provisions for large AN-12 front and rear side feeds. Each block is CT scanned by RHS to make sure they are perfect beyond what can be seen with the human eyeball.