I sit in wonder as to why some people complain so damn much. I understand that this is not an inexpensive upgrade but WHY don't people ask more questions or do more research before reaching for the credit card? I read from people that must have a rosy view, buying stuff on total faith that it will be a perfect fit without any "brain work" at all. Do these same people buy crate motors or actually build them themselves?
I am not an expert at anything automotive but I do have some skills. I am bright enough to understand that some parts require some slight modifications to work.
Any Holley carburetor needs a throttle adapter if the car has an automatic transmission. Sometimes headers need a few dings to clear a torsion bar or steering linkage.