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#302 castings have 1.78" intakes IIRC. And FWIW, my #302's cc'd 57cc....magnums cc'd ~62 cc.

#302 heads on a 360 work great on the street. I've got a bone stock set on top of a very mild 360 (MP RV cam is the only mod) with a 850 TQ and the bottom end is crazy. However it's not your best choice if you want to rev. This is in a 4000 lb Diplomat, 2.94 SG rear, A904 trans, 245 tires...

As mentioned, all LA intakes will fit on all LA blocks. The only thing that might not interchange is the carb. Some of the LA intakes will not accept a spreadbore because when the huge secondary butterflies open they hit the intake.

I agree. Swap the heads.

I just looked at your requirements again.....those are pretty lax. If you find a shop to put your car on the sniffer, I bet you could tune it to pass without a cat.

Here is a log of what I went through to get my car passed in Ontario. The car itself is a '87 Diplomat, which means nothing really. It's a 360 with the MP .430"/.450" cam, #302 heads and a TQ. Also had the original catalytic converter on there......which might be a temporary option for you...