i have a 2 barrel carb on a 307 gmc engine it needs to be replaced popular opinion says to replace with a 4 barrel which would take me off the road for awhile without a garage to do this right for example new manifold etc..... so i want to replace this for the moment with a new 2 barrel where do i find a decent new 2 barrel carb or what kind of throttle base plate do i need to get to have a 4 barrel mount on the existing system i am using now has this ever been attempted with a 4 barrel on a 2 barrel mount