I strongly disagree with the idea of replacing the subframe mounts. They simply don't die that quickly.
I also think you should chuck the "embassy" tires...never heard of them, and a blown tire can be the worst sort of nightmare.
And rotate those tires! I got over 40k out of a set of Z-rated performance rubber, and I simply rotated on schedule and kept an eye on pressures.
"If everything seems under control, you're simply not going fast enough" --Mario Andretti
1995 E500 street car
1986 Porsche 944 Turbo S track car