I got a book a Model A fords and the stock 4 popper could be hopped up a nice bit with little work.  A high compression head will raise compression ratio from 4 to a littler over 6.  A more agressive cam can be bought and then to intake/carb combos.  You can get them  to run 50's (mph).

My question is has anyone done such for plymouths?  Were there police (higher compression ) heads in the day?  What about milling the head to bump compression?  Anybody have a cam regound in a more agressive profile?  I am using a model a stock carb since it has a much better air cleaner than the stock plymouth, otherwise mine is bone stock.
rusty

There was a "Red Dome" head, but don't know much about it.

Rusty,
I asked a very simular question on POC forum. I thought I was going to really catch hell at first, but one gent came back with taking 60 thousands off the head and 10 thousands off the block surface ( I don't know why not all 70 off the head) but these guys know a lot more about the old cars than I ever will I'm sure.. The Red head is a higher compression head the way I understand it.
Glenn