mod problems

wg, thanks for the help.
I checked for the markings on the carbs, but could not find any. The bowl vents tubes are correct as you described. I will check the jug for marking.
Where does the hoses for the emissions go?
Thanks again,

ok, block says 1015. Still can't find any markings on the carb flange. I am thinking only mods made to this was the 4-1 Kerker. Carbs look like they have been on there for a long time, so maybe stock set-up. I am going to remove them and have them cleaned and rebuilt.
Should I go one size bigger on the jets for the exhaust set-up?
Thanks