Is this engine builder nuts?

Peyote said

Assuming that I go with the 318 that I already have, and open up the ports on my 273 heads, are there intakes that are made for 360s that would be a better match for the increased port size? Or do all intakes more or less interchange between 318/340/360?

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273's and 318's use the same small ports, except some police engines. I tend to use small port intakes on small port, 273/318 heads and large port intakes on large port, 340/360, heads, but you can really use any intake on the small port heads without any problems. If you are on a tight budget, all the 340 and 360 intakes are very good.