hello had a freind brought me a 300 that has been sitting for a while...carbs needed kits,gas tank wasnt to bad and didnt have very much so in it so filled tank added seafaom .rebuilt carbs replaced spark plugs and fuel filter,,,car starts right up,,but had a miss....started pulling wires,,,,clys 2468 do not make a difference,1357 do,,,getting good spark from cap to plugs,checked compression 150 on both sides,dist shaft has no play,replaced points(19thous)condenser, cap rotor,swapped wires, no change.also checked for intake leak none found..the exhaust manifold is cold on right side compared to left side..anyone run into this before..any input wouild be appreciated.thanks in adavnce

Do both accelerator pumps work? If not make sure fuel is getting into the carb. that doesn't suirt
If they both work it still makes me think no fuel to the cold bank

Inline or cross ram carbs? If cross ram, make sure the intake isn't rotted out under the carbs.

im checking fuel pressure next ,its line carbs,but front carb doesnt seem to be squirting as much as rear carb,,thanks for input...

I suspect more fuel system contamination than you might think. At the very least I'd change the fuel filter, pull the air horns off and flush them clean of any contaminants. Be a good time to change out the needles & seats, add new acc pumps, and check your float levels. .02