RAM device / timings for small VGA project
You might be better with using the block RAM in a good FPGA as it will easily outperform the performance of external SRAM; also, if you want to make a PCB, routing will be crucial with 54ns clock times. Also, it looks to be only 5V; what FPGAs work on 5V? You'd need logic level translation, introducing delay into the processing.

I figure you need 300KB and FPGAs can have this amount of memory onboard.