I have my small block stroker currently at 25° total timing. I'm wanting the car to slow down another 2 tenths, so I was going to pull the timing down a few more degrees...will this hurt anything? Can I run 20° total timing and not damage anything? I know it will cause more exhaust heat, but is that it?

67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....