Brand new to Thermoquads- a few questions I need help with

hudskit said
Good Evening, All,

I have recieved a nice rebuildable core Carb- series 9103 - a 77 400 HP application that I'd like to use on a set of 302 heads I'll be installing soon on a 273 .

I have been doing my research and I have noticed my target carb- a 1973 340 AT unit has the same Primary jet- 4098/ .098- but has a smaller secondary jet -5143/.143 existing compared to the desired 340 jet- 5137/.137 - and smaller metering rods -existing 2211- compared to the desired 340 AT metering rod 1966- so is this , if I can find the parts , a good idea ? and if so , a reasonably do-able one? What else will I need to be on the lookout for as I try to make this swap to this late model carb? I've already ordered a set of the brass floats and a shop manual , along with a rebuild kit.

does anyone know what the second set of numbers below the model number mean ? Mine has 103 S below the 1903 S on the base plate..

Thanks and Happy Holidays to All!

Try it as is before making any changes. If running that carb make sure you have a working choke. Set your distributor to run without vacuum advance. You will need to adjust the secondary air valve. I second getting the right tool. It is easier to drill jets than to make or modify rods, plus it is reversible. The best TQ's to run are early car and later trucks with ported vacuum for the distributor. I have run a box stock 71-73 340 TQ on a 273 and it was perfect.