As far as I know theses days you have to change out the manifold. Weber carbs are a great upgrade over stock but can be pretty expensive. You can find used Holley setups on the forums pretty cheap I picked up my intake for 120 bucks and spent 300 on a 465cfm carb from summit racing. My buddy had luck tunning a 600cfm on a stock port 12A also!
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1983 Limited Edition SOLD
1977 Mazda REPU I will work on it one day I sware!!
1987 T2 um after the repu is done?? 
2013 Chrysler 200 DD
2009 Dodge Journey
94 Volvo 850 N/A The slowest car I have EVER owned!!!
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