You can turn a 428 into a 455 by grinding a little bit of the bottom of the bores away (for clearance for the rods) and using a 455 crank. A 428 standard bore block can be bored .030" to make it a 455 standard bore if you use the 455 crank. That is the cheapest way to get a 455 4-bolt main bottom end.
Round port heads and the matching intakes are very expensive. The strongest street motor I ever ran was a .030" over 455 4-bolt block (this makes a .060" over 428) with a 428 crank (for roughly 440 cubic inches) with a set of 1970 Ram IV heads, Hooker headers, and a MSD system in a 1970 Trans Am. I used the factory Ram IV intake but deleted the crossover.
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