I am into the job of changing timing sprockets and chain. Chain case cover could come off tomorrow. This car had some rusty coolant when I got it and I did a Prestone flush and refilled with water for a short time, until now. The car does not run hot by the gauge, infrared thermometer at the gooseneck says 180, which is what the new thermostat I put in was rated. I'm just wondering about running some water thru the block when I have the cover off. Are there not access holes from where the water pump pushes and pulls water from the block there? When would I have a better opportunity? Also do folks feel I should replace the hoses that connect the metal cooling lines from the transmission to the bottom radiator tank with fuel injection hose, since the FSM says pressure in that line is 5 to 30 psi. Trying to do this right. Thank you in advance for any help.