My .03 cents.
For those of you whom have never seen a clutch or flywheel come apart, I have one question for you.......do you like your ankles?
I know that that is a little extreme, but you may not know how true it is.
For any performance application that makes some good power and for those that have to meet the rules of the local race track, a scatter shield is an almost paramount device. There are many 'pros' to using a scatter shield and IMHO only one 'con'.
Yes you do have to check run out. You should do it on a stock bellhousing as well. The scatter shield give you many forms of protection, not only for you but for your car, your engine and the transmission itself. They are also available with a few options that are not present on any stock type housing either. You have the provisions for running different types of linkage, from the stock mechanical to hyd. (either a slave or a hyd throwout) and even some reverse pull applications (late model). They also give you the ability to mount just about ANY transmission to your engine. Which is another reason it would be a good idea for the Nash. Depending on how old the Nash is, I dont think it is going to have the stock GM bolt pattern, but then again.....
There are a couple of manufacturers of scatter shields on the market, but I will agree with Camcojb. I have had less run out problems with the McLeod housing....that and I know "Red" at McLeod (from doing the 'Street Twin' clutch development) and if you know anything about this guy is that his products are QUALITY.
Theres nothing wrong with Lakewood scatter shields, I have stuffed alot of those into cars as well, but I am sold on the McLeod product. If you were to place the two different shields side by side and just look at them, you would see what I am trying to convey.
Cody- I'm sorry about the lag in getting back to you on the trans topic, you WILL have mail by Saturday morning.
Now to the only 'con'.....which isnt a big deal, but its weight is the only thing I can say. Considering that the weight is between the wheelbase and in reality it isnt that much weight....I guess there is not enough to steer me away from recommending one.