Late 80's swirl port heads 302/714's

It wouldn't pass at idle, but past in flying colors at 2500 rpm side of the I/M test.
The way i ported the exhaust it cause a Bad reversion at low rpm (The inside of my intake was black ) I also feel that's why it rev so high as well. once that exhaust port started pulling it started pulling fuel from the intake during overlap
stock x head acted like the .474/280 cam i had in it
The "ported" head acted like it had .550+ lift cam and 300+ degree of duration cam.