went that route last year.
540ci ,630lbs trouqe, around 600+ hp. Ran ok but not completetly happy with the tune. If you buy a program to due the tunning yourself, thats the only way to do it. The intake has to be machined. I went carbed this year. A whole lot easier to tune. first 2 Pic 's of machine work I did to the intake.
3rd pic is this year.
The Fuel Injection thing can be done, but
Big $$$$$$$ question, How much time and money do you want to spend

naturally aspirated power
 

i have a n/a 509ci in my baja and it makes 612hp with a rather small cam,cant see why you would need the charger to make that much horse,it must be cool with the charger though.

I tried and spent too many $ on trying to dial in the fuel injection. Finally, 540s and 1050s, a good combo.

650 hp with a 509 = 1.27 hp per CI
650 hp with a 540 = 1.20 hp per CI
800 hp with a 509 = 1.57 hp per CI
It shouldn't be that hard to get those # out of a BBC
at 1.5 HP per CI it gets a lot more costly,but it is good reliable power. just takes real good heads and about 11.0:1 pistons,
and lots of money on the internals.

To be honest, My motor just runs better on the carb. Better mid range. It was way fat at an idle before. The big problem with the 502 mpi injection, the throttle body and the intake really dosen't flow enough air. Thats why I did all the machine work on the intake. It helps.

ak, the motor was built by the guy I bought the boat from. I think it was built more for standing up to the charger, than for building big power.
The blower whine is pretty sweet at about 5200rpm but the surge at idle and around the dock is starting to get old:cool-smiley-011:
Noise, mine is still fat at idle and a little at takeoff. Mark at Precision Marine is doing everything he can to get it right and they are top notch at what they do, he told me the side mounts are just tough to get right. Looks like he's gonna be building me a carb motor next winter:drink:. By the way nice pic of the bilge looks good:D
Scott

Thanks Scott
Mark at Precision Marine did my tunning on the ecu. He is a great guy to work with. As far as the air/fuel ratio it was close. A little lean on the mid range. Its hard for anybody to tune something when they don't have the motor. He was very willing to work with me. I didn't feel like sending it back any more.

I am talking with MR HORSEPOWER ordering some new parts my old set up was 650hp 637tq with a 850 bg, then went to a 1050dom and picked up 20hp from nickerson that got stolen so, after talking to DEAN GELLNER MR H we will change some other stuff to next month and might get 750hp he was saying just how much coin I will have next month.:D

that power level is obtainable w/o the blower, but I would not consider it a great marine package as you are going to have to step it up quite a bit and will not be very user friendly...Rob

My naturally aspirated 540 is about as user friendly/simple, and reliable as you can get.

660hp / 660 tq .. Carburated ... easy

Chris