[Geerhead55]

Are you looking to build a nostalgia type car or a current era stocker or superstocker?
Of course, if its the nostalgia route you're thinking, then a 409 combo would fit the bill.
If you're wanting to jump in on the more modern styles then you need to check out the NHRA classification guide for your year of car and accepted combinations. Theres a lot of good help here from other posters once you figure which way you prefer. My 2 cents. Good luck with your project,,, '62 Impalas are pretty cool in my book.
Danny Durham