im thinking some one sold you a set of knock offfs,,,,
as for the 500 fuel pump,,,last time recently i looked at it was 350 ish bucks,, but its no regular pump its 172 GPH, pump,,,they are the only ones making a large volume mechanical fuel pump for a small block mopar,,,that fits both side water pump out lets,,,
clay smith cams has a 140 GPH mech pump,,killer pump very large in size will only work on the pre 1970 water pump because of the lower hose outlet,,,
made in the US will cost you,,,we are not talking walmart crap here,,
man up and keep an american employeed,,,,lol