I picked up a Gen VI 454 marine engine...
 

Going in a 67 Impala Fastback 700R4.

Self contained radiator...No salt issues!

Stock 330hp, roller cam, forged crank.

ONLY 300 HRS!!!

I want to do a "Mild" rebuild 450-475 hp range...

Any advice would be very, very appreciated...

I have some parts for it including a hot roller cam and oil pan that should fit your chassis.

you can easily get that kind of power. Here is a good write up on Mark IV and Gen V and Gen VI rat motor differences.

http://www.chevyhiperformance.com/te...ons/index.html

What about the heads????
 

Great article, thanks for the link!

Can this much power (450-475hp) be made with a new cam, 9.8 to 1 Pistons, Edelbrock RPM airgap Intake and 750 cfm carb?

Looking for pump gas, daily driver reliability, with the stock heads...

I'm a school teacher w/ a laughable budget!!!

Is the cam a streetable cam?

PM sent.

Yep, I sent you the specs by PM. My engine had 9.5-1 compression and Dart Pro1 heads. Here is the chassis dyno.
http://i200.photobucket.com/albums/a...nosheetstd.jpg
http://i200.photobucket.com/albums/a...day3-09007.jpg

Are the heads on this stock motor capable of a 450-475 hp build?
 

I think they are oval port but not sure, the intake is still on the motor, is there any way to tell externally?
Thanks in advance...

Pull a valve cover and read the casting number there - just do a quick Google of that number...

thanks for the idea greg..
 

i will tomorrow.

Make sure it is not a reverse running motor. To keep a bigger boat going straight they reversed I think the starboard motor on some boats so the props were spinning into each other.