the Buick 400ci, 430ci and 455ci are all nominally the same except for bore diameter. although, obviously there are emissions changes over the years.
one common problem for guys putting 455 heads on 430 blocks ( and vice versa ) is the circular vs double scallop coolant passages.
http://www.buickperformanceclub.com/idblock.htm
455 and 430 also used different dia push rods, so you ought to be careful about your rockers.
http://www.1badriv.com/
www.TAPerformance.com is the major Buick supplier and is thoroughly versed in all of the intricacies of swapping parts between various generations of the BBB.
as to your specific question, yes, the 455 intake should work on the 455 heads.
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