Hi Ice,
I'm not sure what you want from your new drivetrain package, but since your drb kit seems to be the same as mine and I have recently had a 347 conversion completed, I thought you may be intereseted in my reasons behind the decision to go with this setup.
Here's a pic from my 347 bottom end.
The block came from a 91 stanga It's had 3 hard days on the dyno plus 2000klms on the road including a 1500klms round trip through the snowy mountains on the weekend without an issue. The rev limiter is set at 6500rpm and I don't think that it will spend too much time up in that range as peek tourqe is at 4700rpm.
My position is that although the thicker blocks (like the dart) give you some extra rigidity etc, they are not really essential when building a street donk that will do a little track time. The obvious weekness is in prolonged exposure to high rpm consistent with track racing. I decided that for me, it was more important to have a mildly lumpy street motor with quality internals than an ultimate screamer that can endure consistantly high rpm's. Another option if you would like to stroke you current block could be a 331 kit? Ofcourse you would have to have the block tested as mentioned by others.
The other significant factor in my decision was that I wanted to use the same block so that all of my documents remain current and there was no need to complicate any of my engineers documents.
My 2c
