Hey I just got my first jet .its a 78 19ft spectra with a 454.i was curious what Ho and specs were for the motor.looks to be all stock,I did a numbers check on motor,and build date is 6-30-77.so I am pretty confident it is original motor.it has a Berkeley jet on it,not sure which model.has a place diverter(hydraulic)as well.thru transom exhaust.any info anybody has on the old spectra jets wud b appreciated.i took it out couple times at end of summer last year when I got it,with 3 guys and heavy cooler ,bothbtanks full and a pull tube layn on engine cover  gps got it at 60mph.water wasn't the smoothest.it will hit around 4800-4900rpms.is this pretty decent for this type of boat?thanks for any info guys.