Why is it that there are no roots type blowers for early 340's?

Yeah Usually the budget will be pretty high for a supercharged application... But it is pretty high for a built NA engine too.
I'm going to supercharge one of mine... But I am using a eaton supercharger and will be sticking it under a stock hood (hopefully). I will be making everything for mine. I have access to CNC equipment so I can make the attachment plates and everything. I'll be sure to post pics of the progress as I complete it. But it might be a while.