The size of the flames are regulated by three things. First is the fuel....kerosene burns slower but gives longer flames, coleman fuel burns faster and gives brighter flames. I know you can use gasoline but it is a bit much for my taste. The second factor is the pressure from the pump (I used 7psi without a regulator) and the opening on the solenoid (it is adjustable for flow). The third factor is the momentary switch...the longer you stay on it the more flame....quick tap and quick burst...I'm hittin a show this weekend with the flames and will send some pics. I am in Riverdale right by the airport. The car was painted in Conyers and the airbags were done in Forest Park.
PSS There is a website that shows you how to change the COLOR of the flames but I don't know what it is right now...I'll look it up and let you know.
Oh yeah, for injectors...you can use standard carb injectors or NOS injectors.