If proposed changes to small business size standards are finalized, most of the nation’s engineering fims will be defined as small businesses, allowing them access to set-aside contracts that should go to “truly small firms,” the American Council of Engineering Companies said this week. The Small Business Administration (SBA) is redefining what constitutes a small business in the professional, scientific and technical services sector for the first time in more than 25 years. SBA has said the changes aim to reflect the current realities of industry. For example, the revenue standard defining a small engineering services firm would increase from $4.5 million to…