[DanEC]

Engine blocks are benign - don't really have a personality. It's all about how they are prepared, what's stuffed inside them and how they are operated. A well prepared 428 and a well prepared 427 with comparable heads, intakes, exhaust and internals will pretty much operate indistinguishable from each other. Due to the stroke and bore relationships there may be minute differences but you almost would need an engine dyno to see them.

Only when you start stuffing in 13:1 pistons, 250+ degree - .700 lift cams, single plane intakes and start twisting them north of 6500 rpm and higher is the difference going to show up - probably with the 428 block grenading at some point (but 427 blocks apparently are not immune from that either considering all of them with holed skirts).

The answer is in how you plan to build the engine and how you intend to use it. That and at least another $3,000.

My 3 cents (inflation)