Had the motor rebuilt and now it runs great for 15 minutes or so, and then the brakes start to lock up. Looks like the break line is too close to the headers and is getting too hot. Yeh, I'm a rookie at this.....I changed the brake fluid to dot 5 and flushed but that didn't help. Should I use another type of line for high preformance? I have a 454 bored to 460 in '66 Chevelle. Help