Ok, so im right in the middle of a SBC swap into a 78 280z.  I am far from being in a situation where I can actually think about spending money on cosmetic details, but i guess you could say Im planning ahead. 
  
I eventualy want new wheels.  I really like the look of some steel truck wheels.  My z is dark brown and would (IMO) look killer with some simple steel wheels. 
  
Just an example of the look I like: 
 
  
They are cheap, available, and they arent common (on z's at least)... 
  
Is there any reason I shouldnt go with something like this?  It wont be a track car, its not going to be paticularly high performance, but if the weight of a wheel makes a big enough deal I may consider other options. 
  
Maybe there is another aspect im overlooking?   
  
The fact that I rarely see these type of wheels on cars makes me think there is some good reason that I shouldnt be using them...  Can you manage to talk me out of steel wheels?