The best replacement for 427 is 454.

The best alternatives to 427 are rated as following:
★★★★★  454
★★★★  428
★★★★  496
★★★★  502
★★★  383
★★★  460
★★★  396
★★★  426
★★★  408
★★  350
★★  429
★★  chevy 427
★  434
★  454 chevy
★  440
★  426 hemi
★  383 stroker
  427
  ford 427
  351
  428 cobra jet
  mach 26
  408 stroker

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427
454
428