For 1964 Chevrolet offered a hi-performance 365 HP 327 with solid lifters, high-lift long-duration camshaft, 2 ½ inch exhaust and a Holley carburetor.. This engine option known as RPO L76 was originally offered in late1963 for 1964 model Corvettes and Chevelles. Reportedly a few Chevelles were ordered with this option but due to manufacturing shortages none were ever delivered. The engine was ultimately restricted to Corvettes only. Impalas were limited to a hydraulic lifter 327 rated at 300…