i 'm pretty sure i'm buying this guys car 73 imperial. please help what do i do to fluish this thing so i dont have to stop every hour on a 12-1400 mile trip.( it'll take 3 mos. to get home!)how does some one flush the block? i think flushing the rad. cleans the block anyway, right? rem. a freeze plug is a pain, isn't it. this is my 2nd imp. i had a 68 lebaron in 1989 i got free from an old man it needed too much work the gas gauge was broken it ran out on the hiway twice! i sold the car for the 440 the guy rebuilt it and put it in a charger when dis assembling he found a broken ringt in the motor. also with all big block mopars i got horrible VAPOR LOCK on hot days. how does one prevent this? thanks!