Smaller is better these days. There is no need for 3" main blocks on a H16. 2 1/4" blocks give lower profile/better stack up, are less expensive and work well with a stock 3/8" dacron sheet. Even better is to downsize to a 5/16" spectra/polypro main sheet. If you really want to go crazy ($$) go to 40mm or 50mm carbon blocks with spectra/polypro or other "high tech" main sheet.