Engine build opinions?

The tranny would be that much work, the Vdrive has about 3 times the hoses though. That ones pretty easy to talk myself out of because I would have to pull the backseat, panel and floor to show it off. I did have some floor epoxy color matches to silver cloud for the bilge. Hopefully it will go on pretty smooth and I won't have to sand and polish to make it shine which is why I passed on the gel.

Which way did you tilt the carb, and how much, I can see the tilt on mine too,my motor sits pretty flat in the boat. With the engine being backerds I might need to go the opposite way.

She runs awesome. The only issue I have is it will run 5900 rpms. I have the acme 540 and not sure if I should re-prop, but at what point is too many rpms on the 351. The rings and bearings looked new, so we didn't tear it down completely.

I backed out of the throttle as it hit 5900 rpms. I know if I stayed in it, it will hit 6000 plus. What do you guys think?

the airguides only go to 50 and they were pegged. I backed out before it hit 6. It was still pulling.

why didn't you stay in it? chicken?

I agree with Pete. The numbers you're claiming are a good bit beyond what we've come to expect from this combo. Verify the tach is correct and get a GPS on the thing. Alan's 55mph 380hp '81 ran 5800 or so with the 540 and required a 430 to get the revs back down, but I don't think you're quite at that power level.

It's possible that you have a fast hull that's giving you a higher top end than is typical with the gt40/gt40p upgrade, but I'd be darn sure that's the case before re propping. Get a shop tach and compare it to yours and see how close they are. If original, I wouldn't put much faith in the old Teleflex. Also get a GPS on the thing. If you're doing 53, tht alone would make me think the tach is lying. If its 56-57, that's something else altogether.

While I wouldn't spin the thing to the moon, going to a larger prop puts more stress on the engine and tranny, so keep that in mind.

Don't get me wrong- if that 6k rpm is legit, I'd be looking at a 430. I just wouldn't necessarily believe it without better data. If, in reality, you're closer to 5500, then the 540 is probably what I'd keep on there.

I have to agree with these guys sounds a bit high with your build add-on's.
With the 1:1 the GPS will tell if the tach is good or not.