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It seemed like a very easy swap to me. You will need a different intake, 351 swap headers, a 351 distributor, a different oil pan, and a different belt. Everything else should bolt up. The timing cover, water pump, and front accessories can all be re-used. Oh yeah, 351's use 1/2" head studs, so you may need to open up the holes in your heads to accept 1/2" studs. The AFR 225's, and I think the 205's, do not require drilling to fit 1/2" studs.
If you can afford the
Kooks headers, get them!! They are individual tubes which make them very easy to install.
www.kookscustomheaders.com
I also recommend a high-tourqe starter before you put everything back together. I got the Powermaster XS series one from summit. It's not specifically for our cars, but it works.