Roger----for filling the engine, anywhere on top is good to use---there are kits out there for flushing that are valves that go in the heater lines and you just hook a garden hose to--

If the water won't flow into the engine you might have to remove the themostat or fill it before you put the stat in---another deal these days with engines that have been around for both v belt and serpintine is the rotation of the water pump-----

As for the puke tank and recovery type rad caps---thats not necessary on vehicles with vertical rads---its necessary on crossflow rads that are lower than the fill/high point of the system---if a crossflow isn't completely full there will be air going across the top rows of rad tubes and mixed with water at the other end going into engine then in a foamy/bubbly state which won't transfer heat and then that creates hot spots which then get hotter and hotter----------

Another issue with the recovery caps( they are higher pressure ratings) on earlier rads is they can cause failures of the rad tank seams because of the increased pressure

Em---the Jerry line can be clamped off with a small c clamp, vise grips or hose clamper pliers

An item of interest for all--the 92-97 LT1 GM engines had a small bleeder screw fitting ( 1/8 npt ) that I use in a lot of cases to be able to bleed off air in systems---I buy them by I think 10 packs---I'll see if I have the part number somewhere---makes it easy to get rid of air in systems where you can't risk ---Oh, it'll probably be ok after a couple of warmup/cool downs