home intake porting

Putting my motor together this weekend... just pulled the new intake out of the box and there is quite a bit of casting irregularity in the ports..

I was thinking of taking a dremel and CAREFULLY cleaning them up..

how far into the port should I go?? any other suggestions??

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Black, 84 GT, T5, ground effects, shorty headers, dual exh., rear spoiler from a 87.. In the works; 4:10's, 89 ported heads, edelbrock Performer, matched cam and holley carb (?? size)