old doesn't matter. when i worked at dyno shop our units were from the 70's and performed just fine.
the ability of the operator is the problem here.
linkage all fucky and carb not going WFO? fired.
no scope on the engine? fired.
no EGT or O2 sensors? fired.
no test mule carb, distributor or tuning materials? fired.
you can have the most whiz-bang johnny hot **** computer controlled system in six counties, but if you can't check the carb for WFO and tell that a cylinder is dropped then you ain't worth a ****.