1993 Chevy Corvette Low Oil Pressure and Smell

I recently traded for a Corvette with 160xxx miles. I recently had to replace two piston rods as they broke. After they were replaced I noticed oil pressure was a little low generally at about 50% when driving it hard and also I could smell oil when the windows are up. Now the oil smells clean not at all burned but what could causing the smell and the low oil pressure. I also recently had the oil changed.