? metering block's

Picked up a box a goodies at the swap meet, 950 proform body an base and misc bowls, the metering blocks are 4781s,, have 7047 and 7049, cant find any info as to witch is primary an sec. or if they are even worth putting on the new body,,, any one can tell me what they are from and if they will work....................All for 45$