Since im replacing the headgaskets (slowly but surely between work, school, weather and when im not in excrutiating pain), when its all cleaned up and back together, should i switch to dexcool? will i get any benefit? the dexcool is supposed to be more friendly on the gaskets supposedly? (the car is a 95 LT1)

also, before i get everything back togehter, whats the best way to clean out the motor from the crappy oil/coolant mixture? unfortunately, i dont have a garden hose readlily available (i live in an apartment, and doing this in the parking lot.) the radiator i can just yank out and take it to a hose and flush it out completely, but the motor is gonna be hard to do lol. but once its back together, i can run it somewhere (35 miles away) to families house in pasco and flush the coolant again and refill it but im not thinking thats a great idea.

any thoughts?