Isn't the cross tube type essentially a racing part since it doesn't have a thermostat provision? I guess the question is whether accuracy and streetability are important. I'd go with the one that has a thermostat housing.
Either way, I got mine from this guy:
http://www.ford-y-block.com/
I see you are in Eustis. Drop me a line and swing by the house. I am in NW Apopka near Ponkan and Plymouth-Sorrento Rd. I am getting ready to install Webers on my car (within the next 2 weeks).