i would leave the ports alone...on the motor it is designed for it will offer the right tuning.

seeing as the intake was designed for a smaller bore 273 IMO it wouldn't make sense to molest a nice intake to fit a 318/340/360.

if anything see if you can get the 273 heads to fit the 318 and then you can run the intake.

1966 Dart GT ...down to only 1 mopar for the first time in 15 years!