Rick, FWIW, I recommended you first, in this thread, and unless I do it myself, I'll be talking to you if/when I build another SBF. You might still end up with my current car one day. I've seen nothing but outstanding results from you, and have never heard a negative comment. Plus, I've enjoyed a couple/few conversations with you in the past. The OP seems relatively set on going crate (see my vistor messages), although I don't see the difference in ordering a crate motor and picking a good builder. I doubt these motors are sitting around waiting to be shipped.
Anyway, Robertdeuce, I wouldn't go the complete cruiser route for 1 major reason - it's carbed. Oh, and I remembered the guy's name, it's Woody, I think. Other things that pop out at me, the 170cc heads are the standard ones on the complete cruiser - they aren't enough IMO for a 347. The 28oz balance is nice, but not necessary on a budget and a 50 oz can absolutely be spun above 6000 rpm. Your computer, I've recently heard, won't let the motor spin above 6500. The stock dizzy is fine, why buy another unless yours is worn out?
That's about all I can think of.
Now, being a new guy you might tend to be concerned when a lot of guys on a site recommend another forum member, Rick91GT. What I'd ask you to do is go back and look at threads from his customers. Here's one I highly recommend, but I've already got dibs on his car if he ever decides to sell it. So, don't try
http://www.stangnet.com/mustang-forums/members/89stang1/