Tony, I think you've misinterpreted the water pump pics , the truck one shows a small bump on the front of the head between the head and back plate on the water pump.....which indicates an internal bypass to me........Trevor, as for the actual water pumps, as far as I anm aware ALL mopar 6's used the same basic water pump, so the car ones are fine........I have the electronic dissy from Tom Langdom on the stock engine in my 41 Plymouth Coupe and its the best thing I have ever done, instant starts, seems to run fine.......as for your lack of oil filter, yep some mopars still don't have them.......when I got my 41 Coupe 3 yrs ago, it was an older restoration without a filter, I got the beehive filter shown in the pic and had the braided stainless lines made up.......you can use the type of external filter that early Holdens used, the metal canister that may or may not have a replaceable element and bolt it on the side of the block or firewall.......down where the dissy fits into the block there are a number of small "bolts" that screw into a length ways oil passage any of these can be used to draw oil and there is another screwed in plug near the dipstick that is the return line........anyway welcome to the best bunch of guys on the web, friendly and helpful.......regards, andyd