Running blowers in series wouldn't give you a flow increase, but it would give a pressure increase, but that's if you were trying to go over 20psi. Running thrm in parallel has actually been done but it was on a 351 in a 88' Turbocoupe chassis. The car ran into the 9's. I don't think the website is up anymore but it was under Toohighpsi.
Room would be a huge concern and using 94-95 ford superchargers would be much smaller footprint. That and they have keyed pulleys instead of a press on pulley. The other issue is you would need to use a larger belt with at least 8 ribs or 10 ribs, so there's that.
