Data and record management service provider Computer Data Systems Inc is paying around $51m in cash and stock to acquire Analytical Systems Engineering Corp. Rockville, Maryland-based CDSI intends to purchase all the outstanding capital stock of the privately held company and said Analytical Systems should count for between $75m and $80m in revenues for its 1998 fiscal year. Technical services company Analytical Systems will trade as a unit of CDSI and will retain its management.