i have an 18 ft nordic bubble deck. this past winter i went threw the motor and installed new bearings and rings a cam and a set of closed chamber heads off a 396. i had the heads built with new valves, new springs and roller rockers. installed a new set of rewarder ot headers and a new 850 cfm holley dp. the engine is a 454 bored 30 over. my question is that i still cant turn it past about 4500 rpm, last year with my 30 year old motor i was pulling 4300 rpm. what gives? i now my pump is worn out, it also is 30 years old without any overhauls sense new. i now this because i got the boat from the original owner. any help or a point in the right direction i would appreciate it greatly!