the repops as i understand (which may be wrong) are avail thru certain suppliers only. i have a set on mine. mine were purchased thru carl's ford parts
he has a web site, with that being said the carbs i got were crappy at best,
they were new but required total disassembly and casting flashing removed from
just about every surface. nothing was nice except the fuel bowls. even had flashing covering some metering plate holes over 25%. i have at least 20 hours
into making them right. oh and they still leak. is it that i am just lucky or are they all like this? i can't say for sure but be forwarned. if i was making the decision now, i would go with the new carbs suggested in the previous thread. the 1850's
you can use any vacuum carb as long as it doesn't have secondary metering blocks, you must use the
zinc type jetting plates for the secondary circuit because of clearance between the carbs.
as far as the tuning no matter what you buy you will have to jet them according to your setup, the factory jetting will be too lean if you as much as put in a cam other than factory lift and duration.
buy smart the factory repops don't offer anything except the ford numbers stamped on the airhorn.